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Rowan Transaction Assets Acquired Liabilities Assumed (Details) - USD ($) $ in Millions |  | 12 Months Ended
--- | --- | ---
Apr. 11, 2019 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Liabilities: |  |  |  |
Current Portion of Long term debt |  | $ 203.2 |  |
Long-term Debt |  | 1,910.9 |  |
Bargain purchase gain |  | 637.0 | $ 1.8 | $ 140.2
Rowan Companies [Member] |  |  |  |
Business Acquisition [Line Items] |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount | $ 208.3 |  |  |
Assets: |  |  |  |
Cash and cash equivalents |  | 931.9 |  |
Accounts Receivable |  | 203.5 |  |
Other current assets |  | 99.2 |  |
Long -term notes receivable from ARO |  | 454.5 |  |
Investment in ARO |  | 141.3 |  |
Property and equipment |  | 2,964.0 |  |
Other assets |  | 43.0 |  |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities |  | 273.1 |  |
Other liabilities |  | 410.4 |  |
Net assets acquired |  | 2,039.8 |  |
Less: Merger consideration | (1,400.0) | (1,402.8) |  |
Bargain purchase gain |  | 637.0 |  |
Rowan Companies [Member] | Previously Reported [Member] |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents | 931.9 |  |  |
Accounts Receivable | 207.1 |  |  |
Other current assets | 101.6 |  |  |
Long -term notes receivable from ARO | 454.5 |  |  |
Investment in ARO | 138.8 |  |  |
Property and equipment | 2,989.8 |  |  |
Other assets | 41.7 |  |  |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities | 203.2 |  |  |
Current Portion of Long term debt | 259.4 |  |  |
Long-term Debt | 1,910.9 |  |  |
Other liabilities | 376.3 |  |  |
Net assets acquired | 2,115.6 |  |  |
Less: Merger consideration | (1,402.8) |  |  |
Bargain purchase gain | $ 712.8 |  |  |
Rowan Companies [Member] | Restatement Adjustment [Member] |  |  |  |
Assets: |  |  |  |
Cash and cash equivalents |  | 0.0 |  |
Accounts Receivable |  | (3.6) |  |
Other current assets |  | (2.4) |  |
Long -term notes receivable from ARO |  | 0.0 |  |
Investment in ARO |  | 2.5 |  |
Property and equipment |  | (25.8) |  |
Other assets |  | 1.3 |  |
Liabilities: |  |  |  |
Accounts payable and accrued liabilities |  | 0.0 |  |
Current Portion of Long term debt |  | 13.7 |  |
Long-term Debt |  | 0.0 |  |
Other liabilities |  | 34.1 |  |
Net assets acquired |  | (75.8) |  |
Less: Merger consideration |  | 0.0 |  |
Bargain purchase gain |  | $ (75.8) |  |

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