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Basis For Presentation (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Dec. 31, 2019
Organization, Consolidation and Presentation of Financial Statements [Abstract]          
Repayments of Long-term Debt $ 350.0 $ 3.0 $ 350.0 $ 3.0  
Borrowings under revolving credit facility 0.0 $ 0.0 350.0 $ 0.0  
Line of Credit Facility, Maximum Borrowing Capacity (550.0)   (550.0)    
Cash and cash equivalents $ 259.0   $ 259.0   $ 181.0