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Debt - Summary of Long-Term Debt (Detail) - USD ($)
$ in Millions
Mar. 31, 2018
Dec. 31, 2017
Debt Instrument [Line Items]    
Long-term debt, gross $ 1,971.9 $ 1,973.4
Long-term debt and other 1,974.6 1,976.4
Debt issuance costs (15.5) (15.9)
Long-term debt and other, net 1,959.1 1,960.5
Less — Current portion (9.1) [1] (9.0)
Long-term debt 1,950.0 [1] 1,951.5
Credit agreement | Term Loan Facility | Credit Agreement — Term Loan Facility    
Debt Instrument [Line Items]    
Long-term debt, gross 246.9 248.4
Debt issuance costs (1.8) (1.8)
Long-term debt, net $ 245.1 $ 246.6
Debt instrument, interest rate, stated percentage 3.24% 3.00%
Senior notes | 5.375% Senior Notes due 2024 (2024 Notes)    
Debt Instrument [Line Items]    
Long-term debt, gross $ 325.0 $ 325.0
Debt issuance costs (2.3) (2.4)
Long-term debt, net $ 322.7 $ 322.6
Debt instrument, interest rate, stated percentage 5.375% 5.375%
Senior notes | 5.25% Senior Notes due 2025 (2025 Notes)    
Debt Instrument [Line Items]    
Long-term debt, gross $ 650.0 $ 650.0
Debt issuance costs (5.6) (5.8)
Long-term debt, net $ 644.4 $ 644.2
Debt instrument, interest rate, stated percentage 5.25% 5.25%
Senior notes | 3.8% Senior Notes due 2027 (2027 Notes) (1)    
Debt Instrument [Line Items]    
Long-term debt, net of unamortized discount before debt issuance costs $ 745.0 $ 744.9
Debt issuance costs (5.8) (5.9)
Long-term debt, net $ 739.2 $ 739.0
Debt instrument, interest rate, stated percentage 3.80%  
Weighted Average Interest Rate 3.885% 3.885%
Unamortized discount $ 5.0 $ 5.1
Other | Other    
Debt Instrument [Line Items]    
Other 7.7 8.1
Debt issuance costs $ 0.0 $ 0.0
[1] Unaudited.