XML 87 R76.htm IDEA: XBRL DOCUMENT v3.8.0.1
Derivatives - Narrative (Detail) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Mar. 13, 2012
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2014
Dec. 31, 2016
Derivative [Line Items]            
Repayment of debt     $ 200.9 $ 786.6    
Fair Value Hedging            
Derivative [Line Items]            
Reduction to interest expense   $ (0.2)   $ (1.0)    
8.25% Senior Notes Due March 15, 2019            
Derivative [Line Items]            
Senior notes $ 450.0          
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   $ 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     $ 136.7     $ 172.2
Designated Fair Value Hedges | Interest Rate Swap            
Derivative [Line Items]            
Aggregate notional value $ 400.0          
Derivative, inception date     Mar. 13, 2012