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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Investment Owned, Balance [Abstract] |  |  |  |  |  |  |
Equity in earnings of ARO | $ (9.5) | $ (3.7) | $ 0.6 | $ 0.0 | $ (12.6) | $ 0.0 | $ 0.0
Notes Receivable [Abstract] |  |  |  |  |  |  |
Notes Receivable, Related Parties | 452.9 |  |  |  | 452.9 |  |
October 2027 |  |  |  |  |  |  |
Notes Receivable [Abstract] |  |  |  |  |  |  |
Notes Receivable, Related Parties | 275.2 |  |  |  | 275.2 |  |
October 2028 |  |  |  |  |  |  |
Notes Receivable [Abstract] |  |  |  |  |  |  |
Notes Receivable, Related Parties | 177.7 |  |  |  | 177.7 |  |
ARO |  |  |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |  |  |
Lease revenue |  |  |  |  | 58.2 |  |
Secondment revenue |  |  |  |  | 49.9 |  |
Transition Services revenue |  |  |  |  | 17.3 |  |
Total revenue from ARO (1) |  |  |  |  | 125.4 |  |
ARO |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |  |
Revenues |  |  |  |  | 410.5 |  |
Contract drilling (exclusive of depreciation) |  |  |  |  | 280.2 |  |
Depreciation |  |  |  |  | 40.3 |  |
General and administrative |  |  |  |  | 27.1 |  |
Operating income |  |  |  |  | 62.9 |  |
Other expense, net |  |  |  |  | 28.6 |  |
Provision for income taxes |  |  |  |  | 9.7 |  |
Net income |  |  |  |  | 24.6 |  |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] |  |  |  |  |  |  |
Current assets | 407.2 |  |  |  | 407.2 |  |
Non-current assets | 874.8 |  |  |  | 874.8 |  |
Total assets | 1,282.0 |  |  |  | 1,282.0 |  |
Current liabilities | 183.2 |  |  |  | 183.2 |  |
Non-current liabilities | 1,015.5 |  |  |  | 1,015.5 |  |
Total liabilities | 1,198.7 |  |  |  | 1,198.7 |  |
ARO |  |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] |  |  |  |  |  |  |
Total assets | 623.5 |  |  |  | 623.5 |  |
Total liabilities | 0.7 |  |  |  | 0.7 |  |
Maximum exposure to loss | $ 622.8 |  |  |  | 622.8 |  |
Investment Owned, Balance [Abstract] |  |  |  |  |  |  |
50% interest in ARO net income |  |  |  |  | 12.3 |  |
Amortization of basis differences |  |  |  |  | (24.9) |  |
Equity in earnings of ARO |  |  |  |  | $ (12.6) |  |

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