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Derivatives - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Mar. 13, 2012
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2016
Jun. 30, 2015
Jun. 30, 2014
Dec. 31, 2015
Derivative [Line Items]              
Repayment of Debt       $ 2.9 $ 270.8    
Fair Value Hedging              
Derivative [Line Items]              
Reduction to interest expense   $ 0.4 $ 0.5 0.8 $ 1.1    
8.25% Senior Notes Due March 15, 2019              
Derivative [Line Items]              
Derivative, inception date Mar. 13, 2012            
Senior notes $ 450.0 $ 238.9   $ 238.9     $ 238.9
Interest rate 8.25% 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           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   $ 269.9   $ 269.9     $ 268.4
Designated Fair Value Hedges | Interest Rate Swap              
Derivative [Line Items]              
Aggregate notional value $ 400.0 $ 190.0   $ 190.0