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Business Combinations, Goodwill and Intangible Assets - Schedule of Goodwill (Details) - USD ($)
$ in Millions
3 Months Ended 12 Months Ended
Dec. 31, 2019
Dec. 31, 2020
Dec. 31, 2019
Goodwill [Roll Forward]      
Gross carrying value $ 62.4 $ 37.2 $ 62.4
Accumulated impairment loss:      
Beginning balance   (18.4) (18.4)
Impairment loss (25.2) 0.0 (25.2)
Ending balance (43.6) (18.4) (43.6)
Goodwill $ 18.8 $ 18.8 $ 18.8