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Derivatives - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Mar. 13, 2012
Mar. 31, 2017
Sep. 30, 2016
Mar. 31, 2016
Dec. 31, 2014
Dec. 31, 2016
Derivative [Line Items]            
Repayment of debt       $ 1.4    
Fair Value Hedging            
Derivative [Line Items]            
Reduction to interest expense       $ (0.4)    
8.25% Senior Notes Due March 15, 2019            
Derivative [Line Items]            
Derivative, inception date   Mar. 13, 2012        
Senior notes $ 450.0          
Interest rate 8.25%   8.25%      
Maturity date Mar. 15, 2019   Mar. 15, 2019      
Repayment of debt         $ 211.1  
Interest Rate Swap            
Derivative [Line Items]            
Terminated portion of interest rate swap agreement, notional amount     $ 190.0   210.0  
Payment for termination of interest rate swaps         $ 4.2  
Cash received for termination of interest rate swaps     $ 2.5      
Not Designated as Hedging Instrument | Foreign Exchange Contract            
Derivative [Line Items]            
Aggregate notional value   $ 102.3       $ 172.2
Designated Fair Value Hedges | Interest Rate Swap            
Derivative [Line Items]            
Aggregate notional value $ 400.0