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Summary of Significant Accounting Policies, Recent Accounting Pronouncements (Details)
€ in Millions, $ in Millions
Dec. 31, 2020
USD ($)
Mar. 31, 2020
USD ($)
Mar. 31, 2020
EUR (€)
Dec. 31, 2019
USD ($)
New Accounting Pronouncements        
Retained earnings $ 3,705.4     $ 3,348.4
ASU 2016-13 | Cumulative Effect, Period of Adoption, Adjustment        
New Accounting Pronouncements        
Retained earnings       (3.8)
The "Revolving Credit Facility"        
New Accounting Pronouncements        
Borrowings under the Revolving Credit Facility $ 0.0 $ 1,255.6   $ 0.0
The Revolving Credit Facility, Euro [Member]        
New Accounting Pronouncements        
Borrowings under the Revolving Credit Facility   $ 217.4 € 200.0