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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended | 9 Months Ended |
--- | --- | --- | --- | ---
Sep. 30, 2020 | Sep. 30, 2019 | Sep. 30, 2019 | Sep. 30, 2020 | Sep. 30, 2019 | Dec. 31, 2019
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |  |
Total current assets | $ 1,064.8 |  |  | $ 1,064.8 |  | $ 1,064.4
Total assets | 12,911.2 |  |  | 12,911.2 |  | 16,931.2
Total current liabilities | 388.0 |  |  | 388.0 |  | 830.7
Investment Owned, Balance [Abstract] |  |  |  |  |  |
Equity in earnings (losses) of ARO | 3.9 | $ (3.7) |  | (7.6) | $ (3.1) |
ARO |  |  |  |  |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |  |
Total current assets | 597.8 |  |  | 597.8 |  | 623.5
Total liabilities | 0.0 |  |  | 0.0 |  | 0.7
Maximum exposure to loss | 597.8 |  |  | 597.8 |  | 622.8
Investment Owned, Balance [Abstract] |  |  |  |  |  |
50% interest in ARO net income | 12.7 | 5.1 | $ 13.6 | 17.6 |  |
Amortization of basis differences | (8.8) | (8.8) | (16.7) | (25.2) |  |
Equity in earnings (losses) of ARO | 3.9 | (3.7) | (3.1) | (7.6) |  |
ARO |  |  |  |  |  |
Related Party Transactions [Abstract] |  |  |  |  |  |
Lease revenue | 21.0 | 19.9 | 37.0 | 62.4 |  |
Secondment Revenue, Related Party | 0.8 | 17.9 | 33.5 | 20.8 |  |
Transition services revenue, Related Party | 0.2 | 5.0 | 10.2 | 2.2 |  |
Total revenue from ARO | 22.0 | 42.8 | 80.7 | 85.4 |  |
ARO |  |  |  |  |  |
Schedule of Equity Method Investments [Line Items] |  |  |  |  |  |
Equity Method Investment Summarized Fin Information Revenue | 145.6 | 138.4 | 262.2 | 431.9 |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |  |  |
Contract drilling (exclusive of depreciation) | 99.0 | 92.7 | 171.7 | 319.8 |  |
Depreciation | 14.8 | 14.6 | 26.9 | 41.1 |  |
General and administrative | 5.8 | 8.8 | 13.9 | 21.2 |  |
Operating income | 26.0 | 22.3 | 49.7 | 49.8 |  |
Other expense, net | 6.7 | 9.9 | 18.8 | 20.0 |  |
Provision (Benefit) for income taxes | (6.1) | 2.2 | 3.8 | (5.4) |  |
Equity Method Investment Summarized Fin Information Net Income Loss | 25.4 | $ 10.2 | $ 27.1 | 35.2 |  |
Equity Method Investment, Summarized Financial Information [Abstract] |  |  |  |  |  |
Total current assets | 391.9 |  |  | 391.9 |  | 407.2
Assets, Noncurrent | 898.2 |  |  | 898.2 |  | 874.8
Total assets | 1,290.1 |  |  | 1,290.1 |  | 1,282.0
Total current liabilities | 230.8 |  |  | 230.8 |  | 183.2
Liabilities, Noncurrent | 940.8 |  |  | 940.8 |  | 1,015.5
Total liabilities | $ 1,171.6 |  |  | $ 1,171.6 |  | $ 1,198.7

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