Quarterly report pursuant to Section 13 or 15(d)

Long-Term Debt - Schedule of Long-Term Debt (Detail)

Long-Term Debt - Schedule of Long-Term Debt (Detail) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Borrowings under the senior secured credit facility $ 825.0us-gaap_LineOfCredit $ 850.0us-gaap_LineOfCredit
Convertible senior notes, carrying value of liability component 970.5us-gaap_ConvertibleDebt 961.7us-gaap_ConvertibleDebt
Other debt 17.3us-gaap_OtherLongTermDebt  
Total 1,812.8us-gaap_LongTermDebt 1,811.7us-gaap_LongTermDebt
Less: current portion 419.4us-gaap_LongTermDebtCurrent 100.0us-gaap_LongTermDebtCurrent
Long-term portion $ 1,393.4us-gaap_LongTermDebtNoncurrent $ 1,711.7us-gaap_LongTermDebtNoncurrent