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Derivatives - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended 12 Months Ended
Mar. 13, 2012
Sep. 30, 2016
Jun. 30, 2016
Jun. 30, 2017
Jun. 30, 2016
Dec. 31, 2014
Dec. 31, 2016
Derivative [Line Items]              
Repayment of debt       $ 200.4 $ 2.9    
Fair Value Hedging              
Derivative [Line Items]              
Reduction to interest expense     $ (0.4)   $ (0.8)    
8.25% Senior Notes Due March 15, 2019              
Derivative [Line Items]              
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       $ 104.2     $ 172.2
Designated Fair Value Hedges | Interest Rate Swap              
Derivative [Line Items]              
Aggregate notional value $ 400.0            
Derivative, inception date       Mar. 13, 2012