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Intangible Asset - Estimated Amortization Expense (Details) - USD ($)
$ in Millions
9 Months Ended 12 Months Ended
Sep. 30, 2021
Dec. 31, 2020
Goodwill and Intangible Assets Disclosure [Abstract]    
Estimated useful life of intangible asset 11 years 9 months 18 days 12 years 6 months
Finite-Lived Intangible Assets, Amortization Expense, Maturity Schedule [Abstract]    
Succeeding year 1 $ 7.9  
Succeeding year 2 7.9  
Succeeding year 3 7.9  
Succeeding year 4 7.9  
Succeeding year 5 $ 7.9