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Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates (Detail) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Debt Instrument [Line Items]    
Long-term debt and other, gross $ 1,976.4 $ 1,949.4
Debt issuance costs (15.9) (15.8)
Long-term debt, net 1,973.4 1,943.7
Long-term debt and other, net 1,960.5 1,933.6
Less — Current portion (9.0) (35.6)
Long-term debt 1,951.5 1,898.0
Other    
Debt Instrument [Line Items]    
Other $ 8.1 $ 5.7
Credit Agreement — Term Loan Facility | Term Loan Facility    
Debt Instrument [Line Items]    
Stated interest rate 3.00% 2.105%
Long-term debt, gross $ 248.4 $ 468.7
Debt issuance costs (1.8) (1.6)
Long-term debt, net $ 246.6 $ 467.1
4.75% Senior Notes due 2023 (2023 Notes) | Senior notes    
Debt Instrument [Line Items]    
Stated interest rate 4.75% 4.75%
Long-term debt, gross $ 0.0 $ 500.0
Debt issuance costs 0.0 (4.8)
Long-term debt, net $ 0.0 $ 495.2
5.375% Senior Notes due 2024 (2024 Notes) | Senior notes    
Debt Instrument [Line Items]    
Stated interest rate 5.375% 5.375%
Long-term debt, gross $ 325.0 $ 325.0
Debt issuance costs (2.4) (2.8)
Long-term debt, net $ 322.6 $ 322.2
5.25% Senior Notes due 2025 (2025 Notes) | Senior notes    
Debt Instrument [Line Items]    
Stated interest rate 5.25% 5.25%
Long-term debt, gross $ 650.0 $ 650.0
Debt issuance costs (5.8) (6.6)
Long-term debt, net $ 644.2 643.4
3.8% Senior Notes due 2027 | Senior notes    
Debt Instrument [Line Items]    
Stated interest rate 3.80%  
Long-term debt, net of unamortized discount before debt issuance costs $ 744.9 0.0
Debt issuance costs (5.9) 0.0
Long-term debt, net $ 739.0 $ 0.0
Weighted Average Interest Rate 3.885%  
Unamortized discount $ (5.1)