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Derivative Instruments and Hedging Activities (Notional Values and After-Tax Impact of Changes in Fair Value) (Details)
€ in Millions, $ in Millions
3 Months Ended
Mar. 31, 2020
USD ($)
Mar. 31, 2019
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Mar. 31, 2019
EUR (€)
Jan. 31, 2018
USD ($)
Cross currency swap contract | Designated as Hedging Instrument | 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 7.3 $ 6.9        
Foreign currency denominated debt            
Derivative [Line Items]            
Derivative, notional amount 2,882.7          
Foreign currency denominated debt | Designated as Hedging Instrument | Net Investment Hedging            
Derivative [Line Items]            
Gain (loss) on derivative used in net investment hedge, net of tax 0.6 1.7        
Revolving Credit Facility [Member] | Designated as Hedging Instrument | Net Investment Hedging            
Derivative [Line Items]            
Derivative, notional amount $ 120.5 $ 179.8 € 110.0 $ 0.0 € 160.0