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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) | 3 Months Ended | 6 Months Ended |
--- | --- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019 | Dec. 31, 2019
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |  |
Assets, Current | $ 1,066,100,000 |  |  | $ 1,066,100,000 |  | $ 1,064,400,000
Total assets | 13,038,900,000 |  |  | 13,038,900,000 |  | 16,931,200,000
Liabilities, Current | 3,068,100,000 |  |  | 3,068,100,000 |  | 830,700,000
Investment Owned, Balance [Abstract] |  |  |  |  |  |
Equity in earnings of ARO | (5,200,000) |  | $ 600,000 | (11,500,000) | $ 600,000 |
ARO |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |  |
Assets, Current | 593,700,000 |  |  | 593,700,000 |  | 623,500,000
Total liabilities | 0 |  |  | 0 |  | 700,000
Maximum exposure to loss | 593,700,000 |  |  | 593,700,000 |  | 622,800,000
Investment Owned, Balance [Abstract] |  |  |  |  |  |
50% interest in ARO net income | 3,300,000 | $ 8,400,000 |  | 4,900,000 |  |
Amortization of basis differences | (8,500,000) | (7,800,000) |  | (16,400,000) |  |
Equity in earnings of ARO | (5,200,000) | 600,000 |  | (11,500,000) |  |
ARO |  |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |  |
Lease revenue | 19,900,000 | 18,300,000 |  | 41,400,000 |  |
Secondment and Transition Revenue, Related Party | 200,000 | 20,800,000 |  | 22,000,000.0 |  |
Total revenue from ARO | 20,100,000 | 39,100,000 |  | 63,400,000 |  |
ARO |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment Summarized Fin Information Revenue | 146,000,000.0 | 123,800,000 |  | 286,300,000 |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |
Contract drilling (exclusive of depreciation) | 112,500,000 | 78,900,000 |  | 220,800,000 |  |
Depreciation | 13,300,000 | 12,400,000 |  | 26,300,000 |  |
General and administrative | 7,100,000 | 5,300,000 |  | 15,400,000 |  |
Operating income | 13,100,000 | 27,200,000 |  | 23,800,000 |  |
Other expense, net | 6,700,000 | 8,700,000 |  | 13,300,000 |  |
Provision (Benefit) for income taxes | (200,000) | 1,700,000 |  | 700,000 |  |
Equity Method Investment Summarized Fin Information Net Income Loss | 6,600,000 | $ 16,800,000 |  | 9,800,000 |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |  |
Assets, Current | 349,200,000 |  |  | 349,200,000 |  | 407,200,000
Assets, Noncurrent | 924,100,000 |  |  | 924,100,000 |  | 874,800,000
Total assets | 1,273,300,000 |  |  | 1,273,300,000 |  | 1,282,000,000.0
Liabilities, Current | 206,800,000 |  |  | 206,800,000 |  | 183,200,000
Liabilities, Noncurrent | 973,400,000 |  |  | 973,400,000 |  | 1,015,500,000
Total liabilities | $ 1,180,200,000 |  |  | $ 1,180,200,000 |  | $ 1,198,700,000

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