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
Sep. 30, 2016
Dec. 31, 2015
Debt Disclosure [Abstract]    
Senior secured credit facility, carrying value $ 410.0 $ 639.5
Convertible senior notes, carrying value of liability component 1,014.0 982.5
Other debt 18.9  
Total 1,442.9 1,622.0
Less: current portion 425.3 229.5
Long-term portion $ 1,017.6 $ 1,392.5