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Derivative Financial Instruments and Hedging Activities (Details)
$ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Subsidiary
Contract
Dec. 31, 2019
USD ($)
Contract
Dec. 31, 2018
USD ($)
Jul. 01, 2018
USD ($)
Jul. 03, 2016
USD ($)
Derivative, Fair Value [Abstract]          
(Gains) losses in other non-operating income (deductions) $ 5.3 $ 8.2 $ 1.5    
Minimum [Member]          
Derivative, Fair Value [Abstract]          
Number of foreign subsidiaries in which portion of net investment is hedged | Subsidiary 1        
Foreign Exchange Forward [Member]          
Derivative, Fair Value [Abstract]          
Number of contracts | Contract 0 0      
(Gains) losses in other non-operating income (deductions) $ 0.2 $ 2.1 $ (0.7)    
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]          
Derivative, Fair Value [Abstract]          
Notional amount       $ 150.0  
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Non-Current Liabilities [Member]          
Derivative, Fair Value [Abstract]          
Fair value of derivative liability 7.7        
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member]          
Derivative, Fair Value [Abstract]          
Notional amount 29.0       $ 300.0
Cash Flow Hedges [Member] | Designated as Hedging Instrument [Member] | Interest Rate Swap [Member] | Other Current Liabilities [Member] | Maximum [Member]          
Derivative, Fair Value [Abstract]          
Fair value of derivative liability 0.1        
Net Investment Hedge [Member] | Designated as Hedging Instrument [Member] | Cross Currency Rate Swap [Member]          
Derivative, Fair Value [Abstract]          
Notional amount       $ 150.0  
Net Investment Hedge [Member] | Designated as Hedging Instrument [Member] | Cross Currency Rate Swap [Member] | Other Assets and Deferred Charges [Member]          
Derivative, Fair Value [Abstract]          
Fair value of derivative asset $ 0.4