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New Accounting Pronouncements (Details) - The "Revolving Credit Facility" - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
New Accounting Pronouncements    
Borrowings under the Revolving Credit Facility $ 0.0 $ 0.0
Revolving Credit Facility    
New Accounting Pronouncements    
Borrowings under the Revolving Credit Facility $ 0.0