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Debt - Components of Debt (Detail)
€ in Millions, $ in Millions
Sep. 30, 2017
USD ($)
Sep. 30, 2017
EUR (€)
Mar. 22, 2017
USD ($)
Dec. 31, 2016
USD ($)
Debt Instrument [Line Items]        
Total long-term debt, principal amount $ 1,557.6     $ 864.1
Total debt, Unamortized debt issuance costs 21.0     9.8
Senior notes 1,531.2     848.5
Capital leases 5.4     5.8
Total debt 1,536.6     854.3
Capital leases -current maturities 2.6     2.9
Total current debt 2.6     2.9
Total long-term debt 1,534.0     851.4
Current Debt [Member]        
Debt Instrument [Line Items]        
Total debt, principal amount 2.6     2.9
Long-term Debt [Member]        
Debt Instrument [Line Items]        
Total debt, principal amount 1,555.0     861.2
Capital Leases [Member]        
Debt Instrument [Line Items]        
Total debt, principal amount 5.4     5.8
Capital Leases [Member] | Current Debt [Member]        
Debt Instrument [Line Items]        
Total debt, principal amount 2.6     2.9
10.000% Senior Notes Due in 2021 [Member]        
Debt Instrument [Line Items]        
Total debt, principal amount 271.1     384.2
Senior notes 271.1     384.2
5.500% Senior Notes Due in 2024 [Member]        
Debt Instrument [Line Items]        
Total debt, principal amount 531.1     474.1
Total debt, Unamortized debt issuance costs 9.8     9.8
Senior notes 521.3 € 450.0   $ 464.3
5.500% Senior Notes Due in 2025 [Member]        
Debt Instrument [Line Items]        
Total debt, principal amount 750.0   $ 750.0  
Total debt, Unamortized debt issuance costs 11.2      
Senior notes $ 738.8