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Equity Method Investment in ARO - Schedule of Related Parties (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2023
Jun. 30, 2022
Jun. 30, 2023
Jun. 30, 2022
Dec. 31, 2022
Schedule of Equity Method Investments [Line Items]          
Amounts receivable (1) $ 17.6   $ 17.6   $ 12.0
Contract liabilities(2) 11.9   11.9   16.7
Accounts payable(2) 53.4   53.4   43.2
Carrying value 268.0   268.0   254.0
Non-cash amortization (1)     14.0 $ 15.4  
ARO          
Schedule of Equity Method Investments [Line Items]          
Principal amount 402.7   402.7   402.7
Discount (134.7)   (134.7)   (148.7)
Carrying value 268.0   268.0   254.0
Interest receivable 15.1   15.1   $ 0.0
Interest income 7.6 $ 3.0 15.1 5.8  
Non-cash amortization (1) 7.0 7.7 14.0 15.4  
Total interest income on the Notes Receivable from ARO $ 14.6 $ 10.7 $ 29.1 $ 21.2