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Discontinued Operations, Goodwill, and Intangible Assets - Significant components included in Consolidated Statement of Cash Flows (Details) - Held for sale - USD ($)
$ in Millions
3 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Summary of financial information of the Disposal Group    
Property and equipment $ 0.0 $ 0.0
Intangible assets and capitalized debt issuance costs 0.0 0.0
Payments for capital expenditures $ (0.9) $ (3.0)