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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 6 Months Ended
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2019
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
Jun. 30, 2019
EUR (€)
Jan. 31, 2018
USD ($)
Cross currency swap contract | Designated as Hedging Instrument | Net Investment Hedging                
Derivative [Line Items]                
Derivative, notional amount $ 300.0   $ 300.0     $ 300.0   $ 300.0
Gain (loss) on derivative used in net investment hedge, net of tax (5.8) $ (2.1) 1.5 $ 4.8        
Foreign currency denominated debt                
Derivative [Line Items]                
Derivative, notional amount 2,677.7   2,677.7          
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 $ 1.1 0.3 $ 1.7 2.0        
Revolving Credit Facility [Member] | Designated as Hedging Instrument | Net Investment Hedging                
Derivative [Line Items]                
Derivative, notional amount   $ 182.1   $ 182.1 € 110.0   € 160.0