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Debt - November 2016 Senior Term Loan Credit Agreement Amendment - Additional Information (Detail) - USD ($)
$ in Millions
Nov. 21, 2016
Dec. 31, 2016
Nov. 20, 2016
Sep. 30, 2016
Debt Instrument [Line Items]        
Unamortized discount   $ 8.0   $ 3.0
November 2016 Senior Term Loan Credit Agreement Amendment        
Debt Instrument [Line Items]        
Credit facility maturity date Nov. 01, 2023      
Revolving Credit Facility Outstanding $ 1,006.0   $ 27.5  
Redemption of senior notes $ 27.5      
Interest rate 5.625%      
November 2016 Senior Term Loan Credit Agreement Amendment | Minimum        
Debt Instrument [Line Items]        
Unamortized discount $ 5.0      
November 2016 Senior Term Loan Credit Agreement Amendment | Maximum        
Debt Instrument [Line Items]        
Unamortized discount $ 8.0