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Debt - Summary of Long-Term Debt and Related Weighted Average Interest Rates (Detail) - USD ($)
$ in Millions
Dec. 31, 2016
Dec. 31, 2015
Nov. 30, 2014
Debt Instrument [Line Items]      
Long-term debt and other, gross $ 1,949.4 $ 1,973.2  
Debt issuance costs (15.8) (18.4)  
Long-term debt, net 1,943.7 1,965.6  
Long-term debt and other, net 1,933.6 1,954.8  
Less — Current portion (35.6) (23.1)  
Long-term debt 1,898.0 1,931.7  
Other      
Debt Instrument [Line Items]      
Other 5.7 7.6  
Credit Agreement — Term Loan Facility | Term Loan Facility      
Debt Instrument [Line Items]      
Long-term debt, gross 468.7 490.6  
Debt issuance costs (1.6) (2.2)  
Long-term debt, net $ 467.1 $ 488.4  
Weighted Average Interest Rate 2.105% 1.78%  
4.75% Senior Notes due 2023 | Senior notes      
Debt Instrument [Line Items]      
Stated interest rate 4.75%    
Long-term debt, gross $ 500.0 $ 500.0  
Debt issuance costs (4.8) (5.5)  
Long-term debt, net $ 495.2 $ 494.5  
Weighted Average Interest Rate 4.75% 4.75%  
5.375% Senior Notes due 2024 | Senior notes      
Debt Instrument [Line Items]      
Stated interest rate 5.375%    
Long-term debt, gross $ 325.0 $ 325.0  
Debt issuance costs (2.8) (3.2)  
Long-term debt, net $ 322.2 $ 321.8  
Weighted Average Interest Rate 5.375% 5.375%  
5.25% Senior Notes due 2025 | Senior notes      
Debt Instrument [Line Items]      
Stated interest rate 5.25%   5.25%
Long-term debt, gross $ 650.0 $ 650.0  
Debt issuance costs (6.6) (7.5)  
Long-term debt, net $ 643.4 $ 642.5  
Weighted Average Interest Rate 5.25% 5.25%