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Equity Method Investment in ARO - Schedule of Related Parties (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
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Amounts receivable (1) | $ 17.6 |  | $ 17.6 |  | $ 12.0
Contract liabilities(2) | 13.1 |  | 13.1 |  | 16.7
Accounts payable(2) | 54.9 |  | 54.9 |  | 43.2
Carrying value | 275.2 |  | 275.2 |  | 254.0
Non-cash amortization (1)(2) |  |  | 21.2 | $ 37.8 |
ARO |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |
Principal amount | 402.7 |  | 402.7 |  | 402.7
Discount | (127.5) |  | (127.5) |  | (148.7)
Carrying value | 275.2 |  | 275.2 |  | 254.0
Interest receivable | 22.8 |  | 22.8 |  | $ 0.0
Interest income | 7.7 | $ 2.8 | 22.8 | 8.6 |
Non-cash amortization (1)(2) | 7.2 | 22.4 | 21.2 | 37.8 |
Total interest income on the Notes Receivable from ARO | $ 14.9 | $ 25.2 | $ 44.0 | $ 46.4 |

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