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Credit Facilities and Long-Term Debt, Deferred Financing Costs (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Deferred Financing Costs [Abstract]    
Deferred financing costs $ 0.6 $ 0.7
Amortization of financing costs remainder of 2021 0.2  
Amortization of financing costs in 2022 0.2  
Amortization of financing costs in 2023 $ 0.2