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Hedging Activities, Derivative Instruments and Credit Risk, Investment in Consolidated Subsidiaries with Functional Currencies Other than USD (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2017
USD ($)
Contract
Dec. 31, 2016
USD ($)
Dec. 31, 2015
USD ($)
Dec. 31, 2017
EUR (€)
Contract
Aug. 17, 2017
EUR (€)
Dec. 31, 2016
EUR (€)
Dec. 31, 2014
USD ($)
Contract
Derivatives, Fair Value [Line Items]              
Proceeds from the termination of derivatives $ 6.2 $ 0.0 $ 0.0        
Changes in the value of debt and designated interest rate swaps [Abstract]              
Off-balance sheet derivative instruments 0.0 0.0          
Euro Term Loan Due in 2020 [Member]              
Derivatives, Fair Value [Line Items]              
Long-term debt hedged | €       € 613.5 € 615.0 € 387.0  
Cross Currency Interest Rate Swap Contracts [Member]              
Derivatives, Fair Value [Line Items]              
Number of contracts | Contract             2
Notional amount             $ 100.0
Cross Currency Interest Rate Swap Contracts [Member] | Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Notional amount $ 100.0 100.0 100.0        
Cross Currency Interest Rate Swap Contracts [Member] | Not Designated as Hedging Instrument [Member]              
Derivatives, Fair Value [Line Items]              
Notional amount     $ 100.0        
Interest Rate Swap Contracts [Member]              
Derivatives, Fair Value [Line Items]              
Number of contracts | Contract 12     12      
Changes in the value of debt and designated interest rate swaps [Abstract]              
(Loss) gain, net of income tax, recorded through other comprehensive income $ (50.2) 12.6          
Balance included in accumulated other comprehensive income (loss) at December 31, 2017 and 2016 respectively $ 32.1 $ 82.3