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Derivatives - Narrative (Detail)
$ in Millions
1 Months Ended 12 Months Ended
Aug. 31, 2016
Mar. 20, 2014
USD ($)
Mar. 13, 2012
USD ($)
Apr. 09, 2010
USD ($)
Mar. 31, 2012
USD ($)
Dec. 31, 2016
USD ($)
Agreement
Dec. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Derivative [Line Items]                
Repayment of debt           $ 1,013.2 $ 272.7 $ 811.5
Number of outstanding interest rate swap agreements | Agreement           0    
Fair Value Hedging                
Derivative [Line Items]                
Reduction to interest expense           $ (1.0) (2.0) (3.8)
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% 8.25%     8.25%    
Maturity date Mar. 15, 2019 Mar. 15, 2019 Mar. 15, 2019     Mar. 15, 2019    
Repayment of debt   $ 211.1           211.1
4.95% Senior Notes Due April 1, 2014                
Derivative [Line Items]                
Derivative, inception date           Apr. 09, 2010    
Interest rate       4.95% 4.95% 4.95%    
Maturity date       Apr. 01, 2014 Apr. 01, 2014 Apr. 01, 2014    
Repayment of debt         $ 341.8 $ 258.2    
Interest Rate Swap                
Derivative [Line Items]                
Terminated portion of interest rate swap agreement, notional amount         342.0 190.0   210.0
Payment for termination of interest rate swaps               $ 4.2
Cash received for termination of interest rate swaps         $ 11.0 2.5    
Not Designated as Hedging Instrument | Foreign Exchange Contract                
Derivative [Line Items]                
Aggregate notional value           $ 172.2 $ 268.4  
Designated Fair Value Hedges | Interest Rate Swap                
Derivative [Line Items]                
Aggregate notional value     $ 400.0 $ 600.0