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Equity Method Investment in ARO Equity Method Investment In ARO - Summarized Financial Data (Details) - USD ($) $ in Millions | 9 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |
Total operating revenues |  | $ 1,427.2 | $ 2,053.2 | $ 1,705.4
Contract drilling (exclusive of depreciation) |  | 1,458.6 | 1,806.0 | 1,319.4
Other expense, net |  | (794.3) | 604.2 | (303.0)
Depreciation expense |  | 540.8 | 609.7 | 478.9
General and administrative |  | 214.6 | 188.9 | 102.7
OPERATING LOSS |  | (4,322.7) | (668.0) | (235.9)
NET LOSS |  | (4,857.6) | (192.2) | (636.6)
Total provision for income taxes |  | (259.4) | 128.4 | 89.6
Assets: |  |  |  |
Total current assets | $ 1,064.4 | 1,172.9 | 1,064.4 |
TOTAL ASSETS | 16,931.2 | 12,873.2 | 16,931.2 |
Liabilities: |  |  |  |
Liabilities, Current | 830.7 | 426.8 | 830.7 |
Investment Owned, Balance [Abstract] |  |  |  |
EQUITY IN LOSSES OF ARO |  | (7.8) | (12.6) | $ 0.0
ARO |  |  |  |
Related Party Transactions [Abstract] |  |  |  |
Lease revenue | 58.2 | 52.2 |  |
Secondment revenue | 49.9 | 21.6 |  |
Transition Services revenue | 17.3 | 1.3 |  |
Total revenue from ARO (1) | 125.4 | 75.1 |  |
ARO |  |  |  |
Equity Method Investment, Summarized Financial Information, Income Statement [Abstract] |  |  |  |
Total operating revenues | 410.5 | 549.4 |  |
Contract drilling (exclusive of depreciation) | 280.2 | 388.2 |  |
Other expense, net | 28.6 | 26.7 |  |
Depreciation expense | 40.3 | 54.8 |  |
General and administrative | 27.1 | 24.2 |  |
OPERATING LOSS | 62.9 | 82.2 |  |
NET LOSS | 24.6 | 41.3 |  |
Total provision for income taxes | 9.7 | 14.2 |  |
Assets: |  |  |  |
Total current assets | 407.2 | 358.6 | 407.2 |
Assets, Noncurrent | 874.8 | 804.0 | 874.8 |
TOTAL ASSETS | 1,282.0 | 1,162.6 | 1,282.0 |
Liabilities: |  |  |  |
Liabilities, Current | 183.2 | 70.8 | 183.2 |
Liabilities, Noncurrent | 1,015.5 | 950.8 | 1,015.5 |
Liabilities | 1,198.7 | 1,021.6 | 1,198.7 |
ARO |  |  |  |
Assets: |  |  |  |
Total current assets | 623.5 | 585.2 | 623.5 |
Liabilities: |  |  |  |
Liabilities | 0.7 | 30.9 | 0.7 |
Investment Owned, Balance [Abstract] |  |  |  |
50% interest in ARO net income | 12.3 | 20.7 |  |
Amortization of basis differences | (24.9) | (28.5) |  |
EQUITY IN LOSSES OF ARO | (12.6) | (7.8) |  |
Related Party Transactions [Abstract] |  |  |  |
Equity Method Investment, Maximum Loss Exposure | $ 622.8 | $ 554.3 | $ 622.8 |

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