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Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2020 | Mar. 31, 2019 | Dec. 31, 2019
Investment Owned, Balance [Abstract] |  |  |
Equity in earnings of ARO | $ (6.3) | $ 0.0 |
ARO |  |  |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] |  |  |
Total assets | 613.9 |  |
Total liabilities | 0.7 |  |
Maximum exposure to loss | 613.2 |  |
Investment Owned, Balance [Abstract] |  |  |
50% interest in ARO net income | 1.6 |  |
Amortization of basis differences | (7.9) |  |
Equity in earnings of ARO | (6.3) |  |
ARO |  |  |
Related Party Transactions [Abstract] |  |  |
Lease revenue | 21.5 |  |
Secondment revenue | 18.3 |  |
Transition Services revenue | 3.5 |  |
Total revenue from ARO | 43.3 |  |
ARO |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |
Revenues | 140.3 |  |
Contract drilling (exclusive of depreciation) | 108.3 |  |
Depreciation | 13.0 |  |
General and administrative | 8.3 |  |
Operating income | 10.7 |  |
Other expense, net | 6.6 |  |
Provision for income taxes | 0.9 |  |
Net income | 3.2 |  |
Equity Method Investment, Summarized Financial Information, Liabilities and Equity [Abstract] |  |  |
Current assets | 351.2 |  | $ 407.2
Non-current assets | 943.8 |  | 874.8
Total assets | 1,295.0 |  | 1,282.0
Current liabilities | 215.6 |  | 183.2
Non-current liabilities | 992.9 |  | 1,015.5
Total liabilities | $ 1,208.5 |  | $ 1,198.7

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