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Derivatives - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended
Mar. 13, 2012
Mar. 31, 2016
Mar. 31, 2015
Mar. 31, 2014
Dec. 31, 2015
Derivative [Line Items]          
Repayment of Debt   $ 1.4 $ 0.3    
Fair Value Hedging          
Derivative [Line Items]          
Reduction to interest expense   0.4 0.6    
8.25% Senior Notes Due March 15, 2019          
Derivative [Line Items]          
Derivative, inception date Mar. 13, 2012        
Senior notes $ 450.0 $ 238.9 $ 239.0   $ 238.9
Interest rate 8.25% 8.25% 8.25%    
Maturity date Mar. 15, 2019 Mar. 15, 2019      
Repayment of Debt       $ 211.0  
Interest Rate Swap          
Derivative [Line Items]          
Terminated portion of interest rate swap agreement, notional amount       210.0  
Payment for termination of interest rate swaps       $ 4.2  
Not Designated as Hedging Instrument | Foreign Exchange Contract          
Derivative [Line Items]          
Aggregate notional value   $ 264.7     $ 268.4
Designated Fair Value Hedges | Interest Rate Swap          
Derivative [Line Items]          
Aggregate notional value $ 400.0 $ 190.0