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Long-Term Debt, Revolving Credit Facility (Details)
€ in Millions, $ in Millions
12 Months Ended
Dec. 31, 2020
USD ($)
Dec. 31, 2019
USD ($)
Dec. 31, 2018
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Jan. 15, 2019
USD ($)
Jan. 14, 2019
USD ($)
Debt              
Borrowings under credit facilities $ 1,567.4 $ 0.0 $ 0.0        
Repayments under credit facilities 1,568.1 0.0 $ 0.0        
The "Revolving Credit Facility"              
Debt              
Maximum borrowing capacity           $ 2,500.0 $ 2,000.0
Borrowings under the Revolving Credit Facility $ 0.0 $ 0.0   $ 1,255.6      
Interest rate       1.82% 1.82%    
The Revolving Credit Facility, Euro [Member]              
Debt              
Borrowings under the Revolving Credit Facility       $ 217.4 € 200.0