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Equity Method Investment in ARO - Schedule of Related Parties (Details) - USD ($)
$ in Millions
 3 Months Ended 4 Months Ended 5 Months Ended 9 Months Ended
Sep. 30, 2022
Sep. 30, 2021
Apr. 30, 2021
Sep. 30, 2021
Sep. 30, 2022
Dec. 31, 2021
Schedule of Equity Method Investments [Line Items]            
Principal amount $ 246.9       $ 246.9 $ 249.1
Non-cash amortization     $ 0.0 $ 12.9 37.8  
ARO            
Schedule of Equity Method Investments [Line Items]            
Lease revenue 13.8 $ 14.2 21.7 24.5 42.6  
Principal amount 402.7       402.7 442.7
Discount (155.8)       (155.8) (193.6)
Carrying value 246.9       246.9 249.1
Equity Method Investment Summarized Financial Information Interest Receivable 8.6       8.6 $ 0.0
Interest income 2.8 2.7 3.5 4.4 8.6  
Non-cash amortization 22.4 6.9 0.0 12.9 37.8  
Total interest income on the shareholder notes receivable $ 25.2 $ 9.6 $ 3.5 $ 17.3 $ 46.4