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Derivative Instruments and Hedging Activities (Notional Values and After-Tax Impact of Changes in Fair Value) (Details) - Designated as Hedging Instrument
€ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2019
USD ($)
Mar. 31, 2018
USD ($)
Dec. 31, 2018
USD ($)
Jan. 31, 2018
USD ($)
Dec. 31, 2015
EUR (€)
Cross currency swap contract | Net Investment Hedging          
Derivative [Line Items]          
Derivative, notional amount $ 300.0   $ 300.0 $ 300.0  
Gain (loss) on derivative used in net investment hedge, net of tax 6.9 $ (4.6)      
Revolving Credit Facility | Net Investment Hedging          
Derivative [Line Items]          
Derivative, notional amount 179.8   0.0   € 160.0
Foreign Exchange Contract | Net Investment Hedging          
Derivative [Line Items]          
Gain (loss) on derivative used in net investment hedge, net of tax 1.7 $ (10.4)      
Foreign Exchange Contract | Cash Flow Hedging          
Derivative [Line Items]          
Derivative, notional amount $ 205.8   $ 127.0