Long-Term Debt - Additional Information (Detail) - USD ($)
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1 Months Ended |
3 Months Ended |
12 Months Ended |
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Sep. 30, 2015 |
May. 04, 2015 |
Feb. 28, 2014 |
Jul. 31, 2012 |
Mar. 31, 2011 |
Mar. 31, 2014 |
Dec. 31, 2015 |
Dec. 31, 2014 |
Dec. 31, 2013 |
Jul. 26, 2012 |
Mar. 09, 2011 |
| Debt Instrument [Line Items] |
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| Issuance costs |
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$ 6,200,000
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| Allowable annual dividend payment or repurchase of common stock under credit facility |
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$ 233,000,000
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| Credit facility terms description |
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The Credit Facility restricts the Company’s ability to pay dividends or repurchase its common shares to a maximum of $233.0 million until maturity and for every one dollar of share repurchase or dividend paid, the revolving credit facility’s borrowing capacity is permanently decreased by two dollars.
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| Borrowings under the senior secured credit facility |
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$ 639,500,000
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$ 848,300,000
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| Paid-in capital in excess of par value |
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438,200,000
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409,100,000
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| Proceeds received from the issuance of the Convertible notes |
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1,150,000,000
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| Long-term debt |
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1,622,000,000
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1,791,800,000
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| Convertible senior notes, carrying value of liability component |
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982,500,000
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943,500,000
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| Interest expense |
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100,500,000
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91,700,000
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$ 26,600,000
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| Amortization of deferred financing costs |
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8,500,000
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6,800,000
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2,600,000
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| Letters of credit issued but undrawn |
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45,300,000
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| Prepaid forward share repurchase transactions [Member] |
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| Debt Instrument [Line Items] |
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| Paid-in capital in excess of par value |
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$ 31,900,000
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| Forward share repurchase transactions amount |
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$ 685,800,000
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685,800,000
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1,267,100,000
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| Capped call transactions [Member] |
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| Debt Instrument [Line Items] |
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| Capped call transactions with financial institutions |
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123,800,000
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| Convertible Senior Notes [Member] |
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| Debt Instrument [Line Items] |
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| Deferred financing costs |
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21,500,000
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| Total principal amount of convertible notes |
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1,150,000,000
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1,150,000,000
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| Issuance costs |
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26,600,000
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| Paid-in capital in excess of par value |
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219,100,000
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| Proceeds received from the issuance of the Convertible notes |
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1,150,000,000
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| Long-term debt |
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$ 930,900,000
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| Effective interest rate on convertible notes |
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6.20%
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| Unamortized debt discount and debt issuance costs |
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167,600,000
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206,500,000
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| Convertible senior notes, carrying value of liability component |
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982,500,000
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943,500,000
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| Fair value of liability to convertible notes |
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795,900,000
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$ 802,800,000
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| Interest expense |
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61,700,000
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| Non-cash interest expense |
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35,700,000
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| Amortization of deferred financing costs |
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$ 3,200,000
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| Convertible Senior Notes [Member] | Debt Issuance Costs [Member] |
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| Debt Instrument [Line Items] |
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| Paid-in capital in excess of par value |
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$ 5,100,000
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| Convertible Debt [Member] |
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| Debt Instrument [Line Items] |
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| Total principal amount of convertible notes |
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$ 1,150,000,000
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| Debt maturity date |
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Aug. 15, 2019
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| Aggregate principal amount of convertible senior notes issued |
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$ 1,000,000,000
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| Additional principal amount of convertible notes |
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$ 150,000,000
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| Convertible notes, interest rate |
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2.00%
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| Convertible notes, conversion feature |
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Holders of the Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending March 31, 2014, if the last reported sale price of the Company’s common shares for at least 20 trading days (whether or not consecutive) in a period of 30 consecutive trading days ending on, and including, the last trading day of the immediately preceding calendar quarter exceeds 130% of the conversion price for the Convertible Notes on each applicable trading day; (ii) during the five business-day period immediately after any five consecutive trading day period, or the measurement period, in which the trading price per $1,000 principal amount of Convertible Notes for each trading day of that measurement period was less than 98% of the product of the last reported sale price of the Company’s common shares and the conversion rate for the Convertible Notes for each such day; or (iii) upon the occurrence of specified corporate events. On and after May 15, 2019, holders may convert their Convertible Notes at any time, regardless of the foregoing circumstances.
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| Convertible notes, number of trading days of threshold limit (whether or not consecutive) |
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20 days
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| Convertible notes, number of trading days of threshold limit in consecutive days |
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30 days
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| Minimum percentage of common share price over conversion price for conversion |
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130.00%
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| Principal amount of convertible notes |
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$ 1,000
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| Minimum percentage of the product of common share price and conversion rate for convertible notes |
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98.00%
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| Convertible notes initial conversion rate |
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11.5908
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| Convertible notes initial conversion price |
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$ 86.28
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$ 86.28
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| Convertible Debt [Member] | Capped call transactions [Member] |
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| Debt Instrument [Line Items] |
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| Convertible notes initial conversion price |
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$ 86.28
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| Senior secured revolving credit facility [Member] |
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| Debt Instrument [Line Items] |
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| Amount required to maintain on consolidated cash and cash equivalents |
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$ 200,000,000
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| Senior Secured Credit Facility [Member] |
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| Debt Instrument [Line Items] |
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| Credit facility borrowings used to repay outstanding borrowings |
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$ 196,000,000
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| Deferred financing costs |
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$ 5,700,000
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| Credit facility amendment date |
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May 04, 2015
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| Credit facility interest rate description |
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Until March 9, 2016, the applicable interest rates on the Company’s borrowings under the Credit Facility will increase by 2.00% such that borrowings under the Credit Facility will bear interest at either LIBOR plus the applicable margin between 4.00% and 5.00% or the base rate plus the applicable margin between 3.00% and 4.00%.
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| Long-term debt, weighted average interest rate |
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2.78%
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3.04%
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| Credit facility, amount borrowed |
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$ 0
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$ 50,000,000
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763,000,000
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| Credit facility, amount repaid |
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210,300,000
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131,300,000
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$ 319,200,000
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| Borrowings under the senior secured credit facility |
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639,700,000
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850,000,000
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| Foreign currency borrowings, outstanding |
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0
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0
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| Aggregate annual maturities of credit facility, 2016 |
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229,700,000
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| Aggregate annual maturities of credit facility, 2017 |
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410,000,000
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| Aggregate annual maturities of credit facility, 2019 |
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$ 1,150,000,000
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| Senior Secured Credit Facility [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |
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0.40%
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| Senior Secured Credit Facility [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Line of Credit Facility, Unused Capacity, Commitment Fee Percentage |
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0.50%
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| Senior Secured Credit Facility [Member] | Base Rate [Member] |
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| Debt Instrument [Line Items] |
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| Variable rate basis |
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Facility will bear interest at either LIBOR plus the applicable margin between 4.00% and 5.00% or the base rate plus the applicable margin between 3.00% and 4.00%.
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| Senior Secured Credit Facility [Member] | Until March 9, 2016 [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate increase by percentage |
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0.50%
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| Senior Secured Credit Facility [Member] | After March 9, 2016 [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate increased by percentage |
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2.00%
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| Senior Secured Credit Facility [Member] | After March 9, 2016 [Member] | LIBOR [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate |
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4.00%
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| Senior Secured Credit Facility [Member] | After March 9, 2016 [Member] | LIBOR [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate |
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5.00%
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| Senior Secured Credit Facility [Member] | After March 9, 2016 [Member] | Base Rate [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate |
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3.00%
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| Senior Secured Credit Facility [Member] | After March 9, 2016 [Member] | Base Rate [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate |
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4.00%
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| Senior Secured Credit Facility [Member] | Term Loan [Member] |
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| Debt Instrument [Line Items] |
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| Credit facility, maximum amount |
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$ 500,000,000
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| Credit facility borrowings used to repay outstanding borrowings |
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$ 500,000,000
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| Deferred financing costs |
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$ 4,500,000
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| Debt maturity date |
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Mar. 09, 2016
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| Borrowings under the senior secured credit facility |
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$ 229,700,000
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350,000,000
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| Senior Secured Credit Facility [Member] | Convertible Senior Notes [Member] |
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| Debt Instrument [Line Items] |
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| Total principal amount of convertible notes |
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$ 1,150,000,000
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| Senior Secured Credit Facility [Member] | Convertible Debt [Member] |
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| Debt Instrument [Line Items] |
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| Deferred financing costs |
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$ 2,300,000
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| Applicable margin payable, percentage |
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0.50%
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| Consolidated leverage ratio |
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2.50 to 1.00
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| Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member] |
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| Debt Instrument [Line Items] |
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| Credit facility, maximum amount |
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$ 425,000,000
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$ 700,000,000
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| Line of credit facility extended maturity period |
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1 year
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| Amended maturity date of credit facility |
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Mar. 09, 2017
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| Decreased amount in credit facility borrowing capacity |
$ (39,100,000)
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$ (235,900,000)
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| Variable rate basis |
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Credit Facility now bear interest at either LIBOR plus the applicable margin between 2.00% and 3.00% or the base rate plus the applicable margin between 1.00% and 2.00%.
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| Borrowings under the senior secured credit facility |
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$ 410,000,000
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$ 500,000,000
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| Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate |
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2.00%
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| Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate |
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3.00%
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| Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member] | LIBOR [Member] |
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| Debt Instrument [Line Items] |
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| Credit facility LIBOR minimum floor rate interest |
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0.25%
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| Variable rate basis |
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LIBOR
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| Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member] | Base Rate [Member] |
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| Debt Instrument [Line Items] |
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| Variable rate basis |
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The base rate under the Credit Facility represents the highest of the Federal Funds Rate plus 0.50%, the one-month LIBOR plus 1.00%, and the prime rate offered by Bank of America.
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| Base rate in excess of Federal Funds Rate |
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0.50%
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| Base rate in excess of one-month LIBOR |
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1.00%
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| Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member] | Base Rate [Member] | Minimum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate |
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1.00%
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| Senior Secured Credit Facility [Member] | Senior secured revolving credit facility [Member] | Base Rate [Member] | Maximum [Member] |
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| Debt Instrument [Line Items] |
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| Interest rate spread on variable rate |
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2.00%
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