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Derivatives - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Aug. 31, 2016
Mar. 13, 2012
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Dec. 31, 2014
Dec. 31, 2015
Derivative [Line Items]                
Repayment of debt         $ 786.6 $ 271.8    
Fair Value Hedging                
Derivative [Line Items]                
Reduction to interest expense     $ (0.2) $ (0.5) (1.0) $ (1.6)    
8.25% Senior Notes Due March 15, 2019                
Derivative [Line Items]                
Derivative, inception date   Mar. 13, 2012            
Senior notes   $ 450.0 $ 21.3   $ 21.3     $ 238.9
Interest rate 8.25% 8.25% 8.25%   8.25%      
Maturity date Mar. 15, 2019 Mar. 15, 2019 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     $ 260.4   $ 260.4     $ 268.4
Designated Fair Value Hedges | Interest Rate Swap                
Derivative [Line Items]                
Aggregate notional value   $ 400.0