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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) | 3 Months Ended | 6 Months Ended | 9 Months Ended
--- | --- | --- | ---
Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2018
Investment Owned, Balance [Abstract] |  |  |  |  |
Equity in earnings of ARO | $ (3,700,000) | $ 0 |  | $ (3,100,000) | $ 0
Notes Receivable [Abstract] |  |  |  |  |
Notes Receivable, Related Parties | 452,900,000 |  | $ 452,900,000 | 452,900,000 |
ARO |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] |  |  |  |  |
Total assets | 663,300,000 |  | 663,300,000 | 663,300,000 |
Total liabilities | 3,000,000.0 |  | 3,000,000.0 | 3,000,000.0 |
Maximum exposure to loss | 660,300,000 |  | 660,300,000 | 660,300,000 |
Investment Owned, Balance [Abstract] |  |  |  |  |
50% interest in ARO net income | 5,100,000 |  | 13,600,000 |  |
Amortization of basis differences | (8,800,000) |  | (16,700,000) |  |
Equity in earnings of ARO | (3,700,000) |  | (3,100,000) |  |
ARO |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |
Lease revenue | 19,900,000 |  | 37,000,000.0 |  |
Secondment revenue | 17,900,000 |  | 33,500,000 |  |
Transition Services revenue | 5,000,000.0 |  | 10,200,000 |  |
Total revenue from ARO | 42,800,000 |  | 80,700,000 |  |
ARO |  |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |
Revenues | 138,400,000 |  | 262,200,000 |  |
Contract drilling (exclusive of depreciation) | 92,700,000 |  | 171,700,000 |  |
Depreciation | 14,600,000 |  | 26,900,000 |  |
General and administrative | 8,800,000 |  | 13,900,000 |  |
Operating income | 22,300,000 |  | 49,700,000 |  |
Other expense, net | 9,900,000 |  | 18,800,000 |  |
Provision for income taxes | 2,200,000 |  | 3,800,000 |  |
Net income | 10,200,000 |  | 27,100,000 |  |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] |  |  |  |  |
Current assets | 452,800,000 |  | 452,800,000 | 452,800,000 |
Non-current assets | 887,100,000 |  | 887,100,000 | 887,100,000 |
Total assets | 1,339,900,000 |  | 1,339,900,000 | 1,339,900,000 |
Current liabilities | 232,400,000 |  | 232,400,000 | 232,400,000 |
Non-current liabilities | 1,021,700,000 |  | 1,021,700,000 | 1,021,700,000 |
Total liabilities | 1,254,100,000 |  | 1,254,100,000 | 1,254,100,000 |
October 2027 |  |  |  |  |
Notes Receivable [Abstract] |  |  |  |  |
Notes Receivable, Related Parties | 275,200,000 |  | 275,200,000 | 275,200,000 |
October 2028 |  |  |  |  |
Notes Receivable [Abstract] |  |  |  |  |
Notes Receivable, Related Parties | $ 177,700,000 |  | $ 177,700,000 | $ 177,700,000 |

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