Long-Term Debt - Additional Information (Detail)

v3.19.3.a.u2

Long-Term Debt - Additional Information (Detail)								1 Months Ended			3 Months Ended	12 Months Ended
	Dec. 12, 2019 USD ($)	Aug. 15, 2019 USD ($)	Aug. 16, 2018 USD ($)	Aug. 16, 2018 USD ($)	Feb. 15, 2017 USD ($)	Mar. 09, 2016 USD ($)	May 04, 2015	Aug. 31, 2018 USD ($)	Mar. 31, 2018 USD ($) $ / shares	Feb. 28, 2014 USD ($) $ / shares	Mar. 31, 2014 USD ($)	Dec. 31, 2019 USD ($) Day $ / shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Sep. 30, 2018 USD ($)	Mar. 09, 2011 USD ($)
Debt Instrument [Line Items]
Outstanding principal amount												$ 1,929,900,000
Credit facility, amount repaid													$ 1,231,900,000	$ 483,100,000
Loss on extinguishment of debt													48,500,000
Borrowings under the senior secured credit facility												965,300,000	983,600,000
Interest expense												153,000,000.0	181,000,000.0	160,800,000
Amortization of deferred financing costs												5,300,000	7,300,000	8,400,000
Paid-in-capital in excess of par value												366,600,000	341,500,000
Long-term debt												1,803,000,000.0	2,453,800,000
Convertible notes paid												675,000,000.0	582,500,000
Letters of credit issued but undrawn												41,900,000
Capped call transactions [Member]
Debt Instrument [Line Items]
Capped call transactions with financial institutions										$ 123,800,000
Prepaid forward share repurchase transactions [Member]
Debt Instrument [Line Items]
Forward share repurchase transactions amount										685,800,000	$ 685,800,000
Convertible Senior Notes Due 2019 [Member]
Debt Instrument [Line Items]
Outstanding principal amount										1,150,000,000			675,000,000.0
Deferred financing costs											26,600,000
Aggregate principal amount of convertible senior notes issued										1,000,000,000
Interest expense												27,000,000.0	48,500,000	68,200,000
Non-cash interest expense												17,000,000.0	29,800,000	41,200,000
Amortization of deferred financing costs												$ 1,700,000	2,900,000	4,000,000.0
Additional principal amount of convertible notes										$ 150,000,000
Convertible notes, interest rate										2.00%		2.00%
Convertible notes maturity										Aug. 15, 2019		Aug. 15, 2019
Principal amount of convertible notes										$ 1,000
Convertible notes conversion rate										23.1816
Convertible notes conversion price | $ / shares										$ 43.14
Paid-in-capital in excess of par value										$ 219,100,000	5,100,000
Long-term debt										$ 930,900,000
Effective interest rate on convertible notes										6.20%
Convertible notes paid		$ 675,000,000.0							$ 583,500,000
Accrued interest		$ 6,700,000							1,000,000.0
Fair value of liability to convertible notes													662,100,000
Unamortized debt discount and debt issuance costs													18,600,000
Convertible senior notes, carrying value of liability component													656,400,000
Convertible Senior Notes Due 2019 [Member] | Repurchase of 2019 Convertible Notes [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt									13,100,000				13,100,000
Repurchase of convertible notes									475,000,000.0				475,000,000.0
Fair value of liability to convertible notes									459,400,000
Fair value of equity component to convertible notes									123,000,000.0
Reduction to long-term debt representing liability component of convertible notes									446,400,000
Reduction to additional paid-in capital representing equity component									123,000,000.0
Convertible Senior Notes Due 2019 [Member] | Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs											$ 21,500,000
Convertible Senior Notes Due 2024 [Member]
Debt Instrument [Line Items]
Outstanding principal amount												$ 550,000,000.0	550,000,000.0
Deferred financing costs									12,900,000
Aggregate principal amount of convertible senior notes issued									$ 550,000,000
Interest expense												35,800,000	26,600,000
Non-cash interest expense												20,000,000.0	14,500,000
Amortization of deferred financing costs												$ 1,400,000	1,000,000.0
Convertible notes, interest rate									2.625%			2.625%
Convertible notes maturity									Mar. 15, 2024			Mar. 15, 2024
Principal amount of convertible notes									$ 1,000			$ 1,000
Convertible notes conversion rate									16.0056			16.0352
Convertible notes conversion price | $ / shares									$ 62.48			$ 62.36
Paid-in-capital in excess of par value									$ 139,900,000
Long-term debt									$ 410,100,000
Effective interest rate on convertible notes									8.40%
Fair value of liability to convertible notes												$ 508,600,000	448,100,000
Unamortized debt discount and debt issuance costs												112,600,000	134,000,000.0
Convertible senior notes, carrying value of liability component												$ 437,400,000	416,000,000.0
Convertible notes, conversion feature												Holders of the 2024 Convertible Notes may convert their notes at their option under the following circumstances: (i) during any calendar quarter commencing after the calendar quarter ending June 30, 2018, 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 2024 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 2024 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 2024 Convertible Notes for each such day; (iii) if the Company calls the 2024 Convertible Notes for redemption; or (iv) upon the occurrence of specified corporate events. On and after December 15, 2023, holders may convert their 2024 Convertible Notes at any time, regardless of the foregoing circumstances.
Convertible notes, number of trading days of threshold limit (whether or not consecutive) | Day												20
Convertible notes, number of trading days of threshold limit in consecutive days | Day												30
Minimum percentage of common share price over conversion price for conversion									130.00%
Minimum percentage of the product of common share price and conversion rate for convertible notes									98.00%
Deferred financing costs recorded as additional paid-in-capital in excess of par value									$ 3,300,000
Convertible Senior Notes Due 2024 [Member] | Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs									$ 9,600,000
Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Outstanding principal amount												$ 400,000,000.0	400,000,000.0
Deferred financing costs												4,700,000	5,200,000		$ 5,400,000
Aggregate principal amount of convertible senior notes issued								$ 400,000,000
Interest expense												29,500,000	11,100,000
Amortization of deferred financing costs												$ 500,000	200,000
Convertible notes, interest rate								7.25%				7.25%
Convertible notes maturity								Aug. 15, 2026				Aug. 15, 2026
Senior notes, redemption price, percentage								100.00%
Senior notes, redemption price percentage with equity offerings								107.25%
Carrying amount												$ 395,300,000	394,800,000
Fair value of notes												$ 424,100,000	394,600,000
Senior Notes Due 2026 [Member] | Debt Issuance Costs [Member]
Debt Instrument [Line Items]
Deferred financing costs															$ 5,400,000
Maximum [Member] | Senior Notes Due 2026 [Member]
Debt Instrument [Line Items]
Percentage of aggregate pricipal amount of senior notes being redeemed								40.00%
2011 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, amount repaid														410,000,000.0
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount																$ 700,000,000.0
Credit facility amendment date												May 04, 2015
Line of credit facility extended maturity period												1 year
Amended maturity date of credit facility												Mar. 09, 2017
Repayment of prior senior secured credit facility					$ 410,000,000.0
Revolving credit facility termination date												Feb. 15, 2017
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate							4.00%
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate							5.00%
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate							3.00%
2011 Credit Facility [Member] | 2011 Revolving Credit Facility [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate							4.00%
2011 Credit Facility [Member] | 2011 Term Loan [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount																$ 500,000,000.0
Credit facility amendment date												Jul. 26, 2012
Credit facility, maturity date												Mar. 09, 2016
Repayment of prior senior secured credit facility						$ 229,700,000
2011 Credit Facility [Member] | 2011 Term Loan [Member] | LIBOR [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate							2.00%
2011 Credit Facility [Member] | 2011 Term Loan [Member] | LIBOR [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate							3.00%
2011 Credit Facility [Member] | 2011 Term Loan [Member] | Base Rate [Member] | Minimum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate							1.00%
2011 Credit Facility [Member] | 2011 Term Loan [Member] | Base Rate [Member] | Maximum [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate							2.00%
2017 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount					1,450,000,000.0
Credit Facility amended, effective date												Mar. 16, 2018
Deferred financing costs					$ 22,600,000
Credit facility, amount repaid			$ 1,178,100,000										1,226,900,000	73,100,000
Credit facility, amount borrowed														1,300,000,000.0
2017 Credit Facility [Member] | Other Expense (Income), Net [Member]
Debt Instrument [Line Items]
Loss on extinguishment of debt													35,400,000
2017 Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					1.00%
2017 Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Base rate interest rate floor					1.75%
2017 Credit Facility [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					0.50%
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount					$ 150,000,000.0
Credit facility, maturity date												Feb. 15, 2022
Repayment of prior senior secured credit facility			1,178,100,000
Credit facility LIBOR minimum floor rate interest					0.75%
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Base Rate [Member] | Scenario Leverage Ratio One [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					3.50%
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Base Rate [Member] | Scenario Leverage Ratio Two [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					3.75%
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Eurodollar [Member] | Scenario Leverage Ratio One [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					4.50%
2017 Credit Facility [Member] | 2017 Revolving Credit Facility [Member] | Eurodollar [Member] | Scenario Leverage Ratio Two [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					4.75%
2017 Credit Facility [Member] | 2017 Term Loan B [Member]
Debt Instrument [Line Items]
Credit facility, maturity date												Feb. 15, 2023
Outstanding principal amount					$ 1,300,000,000.0
Senior secured credit facility, discount percentage					2.00%
Senior secured credit facility, discount amount					$ 26,000,000.0
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					4.50%
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate					5.50%
2017 Credit Facility [Member] | 2017 Term Loan B [Member] | 2017 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Revolving credit facility termination date												Aug. 16, 2018
2018 Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount			1,250,000,000	$ 1,250,000,000
Credit facility amendment date												Dec. 12, 2019
Deferred financing costs	$ 1,200,000		11,700,000	11,700,000
Credit facility, amount repaid												$ 20,000,000.0	$ 5,000,000.0
Line of credit facility, frequency of interest payments												quarterly
Long-term debt, weighted average interest rate												5.52%	6.80%
Credit facility, amount borrowed													$ 1,000,000,000.0
Borrowings under the senior secured credit facility												$ 975,000,000.0	995,000,000.0
Foreign currency borrowings, outstanding												0	0
Interest expense												58,900,000
Non-cash interest expense												200,000
Amortization of deferred financing costs												$ 1,700,000
2018 Credit Facility [Member] | Minimum [Member] | 2024 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Outstanding principal amount			350,000,000.0	350,000,000.0
2018 Credit Facility [Member] | LIBOR [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												1.00%
2018 Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Base rate interest rate floor												1.00%
2018 Credit Facility [Member] | Federal Funds Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												0.50%
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member]
Debt Instrument [Line Items]
Credit facility, maximum amount			$ 250,000,000.0	250,000,000.0
Credit facility, maturity date			Aug. 16, 2023
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage												0.50%
Borrowings under the senior secured credit facility												$ 0	0
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												2.00%
2018 Credit Facility [Member] | 2018 Revolving Credit Facility [Member] | Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												2.00%
2018 Credit Facility [Member] | 2018 Term Loan A [Member]
Debt Instrument [Line Items]
Credit facility, maturity date			Aug. 16, 2023
Outstanding principal amount			$ 250,000,000.0	250,000,000.0
Borrowings under the senior secured credit facility												$ 234,400,000	246,900,000
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount												233,200,000	245,400,000
Debt instrument, fair value												$ 235,700,000	240,700,000
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												3.00%
2018 Credit Facility [Member] | 2018 Term Loan A [Member] | Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate												3.00%
2018 Credit Facility [Member] | 2018 Term Loan B [Member]
Debt Instrument [Line Items]
Credit facility, maturity date			Aug. 18, 2025
Outstanding principal amount			$ 750,000,000.0	750,000,000.0
Senior secured credit facility, discount percentage			0.25%
Senior secured credit facility, discount amount			$ 1,900,000	$ 1,900,000
Voluntary prepayment premium percentage												1.00%
Borrowings under the senior secured credit facility												$ 740,600,000	748,100,000
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Level 2 [Member]
Debt Instrument [Line Items]
Outstanding principal amount												732,100,000	738,200,000
Debt instrument, fair value												$ 744,800,000	729,300,000
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | 2024 Convertible Notes Exceeds 350 Million [Member]
Debt Instrument [Line Items]
Credit facility, maturity date			Dec. 15, 2023
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Base Rate [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	1.75%			2.25%								1.75%
2018 Credit Facility [Member] | 2018 Term Loan B [Member] | Eurodollar [Member]
Debt Instrument [Line Items]
Interest rate spread on variable rate	2.75%			3.25%								2.75%
Senior Unsecured Notes [Member]
Debt Instrument [Line Items]
Aggregate principal amount of convertible senior notes issued			$ 400,000,000	$ 400,000,000
2018 and 2017 Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense													83,600,000
Non-cash interest expense													2,900,000
Amortization of deferred financing costs													$ 3,200,000
2017 and 2011 Credit Facility [Member]
Debt Instrument [Line Items]
Interest expense														87,000,000.0
Non-cash interest expense														4,200,000
Amortization of deferred financing costs														$ 4,400,000