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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
Jan. 19, 2021
USD ($)
Mar. 31, 2021
USD ($)
Mar. 31, 2020
USD ($)
Jan. 29, 2028
USD ($)
Jan. 29, 2028
EUR (€)
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  
Gain (loss) on derivative used in net investment hedge, net of tax   (4.1) $ 7.3          
Foreign currency denominated debt                
Derivative [Line Items]                
Derivative, notional amount   3,323.6            
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 $ 0.6          
Revolving Credit Facility [Member] | 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                
Derivative [Line Items]                
Fair Value, Net Derivative Asset (Liability) Measured on Recurring Basis, Unobservable Inputs Reconciliation, Gain (Loss) Included in Other Comprehensive Income (Loss) 2.9              
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 $ 297.1 $ 291.0       € 245.7    
Cross Currency Interest Rate Contract, Payment | Designated as Hedging Instrument | Net Investment Hedging | Forecast                
Derivative [Line Items]                
Derivative, notional amount | €         € 247.9