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Long-Term Debt - Schedule of Long-Term Debt (Details) - USD ($)
$ in Millions
Mar. 31, 2021
Dec. 31, 2020
Long-term Debt    
Long-term debt $ 156.6 $ 226.7
Long-term debt discount (2.6) (1.9)
Net long-term debt $ 154.0 $ 224.8