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Derivatives - Narrative (Detail) - USD ($)
$ in Millions
1 Months Ended 3 Months Ended 9 Months Ended
Mar. 20, 2014
Mar. 13, 2012
Apr. 09, 2010
Mar. 31, 2012
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Derivative [Line Items]                  
Repayment of Debt             $ 271.8 $ 811.3  
Fair Value Hedging                  
Derivative [Line Items]                  
Reduction to interest expense         $ 0.5 $ 0.5 1.6 3.3  
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%   8.25%    
Maturity date 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%          
Maturity date     Apr. 01, 2014 Apr. 01, 2014          
Repayment of Debt       $ 341.8          
Interest Rate Swap                  
Derivative [Line Items]                  
Terminated portion of interest rate swap agreement, notional amount       342.0       210.0  
Payment for termination of interest rate swaps               $ 4.2  
Proceeds from termination of interest rate swaps       $ 11.0          
Not Designated as Hedging Instrument | Foreign Exchange Contract                  
Derivative [Line Items]                  
Aggregate notional value         $ 357.6   $ 357.6   $ 377.2
Designated Fair Value Hedges | Interest Rate Swap                  
Derivative [Line Items]                  
Aggregate notional value   $ 400.0 $ 600.0   $ 190.0   $ 190.0