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Hedging Activities and Fair Value Measurements, Investment in Consolidated Subsidiaries with Functional Currencies Other than USD (Details)
€ in Millions, $ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Sep. 30, 2017
USD ($)
Contract
Sep. 30, 2016
USD ($)
Dec. 31, 2016
EUR (€)
Dec. 31, 2014
USD ($)
Contract
Derivatives, Fair Value [Line Items]            
Proceeds from the termination of derivatives     $ 6.2 $ 0.0    
Euro Term Loan Due in 2020 [Member]            
Derivatives, Fair Value [Line Items]            
Long-term debt hedged | €         € 387.0  
Cross Currency Interest Rate Swap Contracts [Member]            
Derivatives, Fair Value [Line Items]            
Number of contracts | Contract           2
Notional amount           $ 100.0
Interest Rate Swap Contracts [Member]            
Derivatives, Fair Value [Line Items]            
Number of contracts | Contract 15   15      
Changes in the value of debt and designated interest rate swaps [Abstract]            
(Loss) gain, net of income tax, recorded through other comprehensive income $ (13.6) $ (5.1) $ (43.2) (11.6)    
Balance included in accumulated other comprehensive (loss) income at September 30, 2017 and 2016, respectively $ 39.2 $ 58.1 $ 39.2 $ 58.1