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Held for Sale and Discontinued Operations - Related Party Transactions within Discontinued Operations and Held for Sale (Details) - USD ($)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2023
Sep. 30, 2022
Sep. 30, 2023
Sep. 30, 2022
Dec. 31, 2022
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Revenues $ 52.5 $ 49.4 $ 156.0 $ 159.7  
Other receivables 7.3   7.3   $ 6.9
Discontinued Operations, Held-for-sale          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Impairment of assets     0.0    
Affiliated Entity          
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]          
Revenues 5.1 9.0 13.2 12.9  
Expenses from transactions 0.9 $ 1.6 4.4 $ 4.0  
Other receivables 1.3   1.3   6.9
Amounts due to affiliates $ 0.2   $ 0.2   $ 0.4