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Fair Value Measurements (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Transfer of assets from level 1 to level 2 $ 0.0 $ 0.0
Transfer of assets from level 2 to level 1 0.0 0.0
Transfer of liabilities from level 1 to level 2 0.0 0.0
Transfer of liabilities from level 2 to level 1 0.0 0.0
Transfer of assets into level 3 0.0 0.0
Transfer of assets out of level 3 0.0 0.0
Transfer of liabilities into level 3 0.0 0.0
Transfer of liabilities out of level 3 0.0 0.0
Significant other observable inputs (Level 2) | Recurring    
Financial Instruments, Financial Liabilities, Balance Sheet Groupings [Abstract]    
Derivative Liability   9.4
Long-term debt $ 1,111.0 $ 2,203.1