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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, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jun. 30, 2021
USD ($)
Jun. 30, 2020
USD ($)
Jan. 29, 2028
USD ($)
Jan. 29, 2028
EUR (€)
Jan. 19, 2021
USD ($)
Jan. 19, 2021
EUR (€)
Dec. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
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 3.8 $ (5.8) (0.3) $ 1.5            
Foreign currency denominated debt                    
Derivative [Line Items]                    
Derivative, notional amount 3,489.2   3,489.2              
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 0.0 $ 1.1 0.0 $ 1.7            
Revolving Credit Facility | Designated as Hedging Instrument | Net Investment Hedging                    
Derivative [Line Items]                    
Derivative, notional amount | €                   € 110.0
Cross Currency Interest Rate Contract, Receipt | Designated as Hedging Instrument | Net Investment Hedging | Forecast                    
Derivative [Line Items]                    
Derivative, notional amount         $ 300.0          
Cross Currency Interest Rate Contract, Payment | Designated as Hedging Instrument | Net Investment Hedging                    
Derivative [Line Items]                    
Derivative, notional amount $ 294.3   $ 294.3       $ 297.1 € 245.7    
Cross Currency Interest Rate Contract, Payment | Designated as Hedging Instrument | Net Investment Hedging | Forecast                    
Derivative [Line Items]                    
Derivative, notional amount | €           € 247.9