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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 |

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