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Basis For Presentation (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2021
Mar. 31, 2020
Dec. 31, 2020
Organization, Consolidation and Presentation of Financial Statements [Abstract]      
Repayments of Long-term Debt $ 359.0    
Borrowings under revolving credit facility 350.0 $ 350.0  
Line of Credit Facility, Maximum Borrowing Capacity 550.0    
Cash and cash equivalents $ 645.0   $ 535.0