Quarterly report pursuant to Section 13 or 15(d)

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

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Long-Term Debt - Schedule of Long-Term Debt (Detail) - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Debt Disclosure [Abstract]    
Borrowings under the senior secured credit facility $ 689.7 $ 850.0
Convertible senior notes, carrying value of liability component 979.5 961.7
Other debt 13.8  
Total 1,683.0 1,811.7
Less: current portion 293.5 100.0
Long-term portion $ 1,389.5 $ 1,711.7