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Rowan Transaction Assets Acquired and Liabilities Assumed (Details) - Rowan Companies [Member] - USD ($) $ in Millions |  | 3 Months Ended
--- | --- | ---
Apr. 11, 2019 | Mar. 31, 2020
Business Acquisition [Line Items] |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  | $ 208.3
Assets: |  |
Cash and cash equivalents |  | 931.9
Accounts receivable |  | 200.2
Other current assets |  | 99.0
Long-term notes receivable from ARO |  | 454.5
Investment in ARO |  | 141.3
Property and equipment |  | 2,963.8
Other assets |  | 42.8
Liabilities: |  |
Accounts payable and accrued liabilities |  | 275.1
Current portion of long-term debt |  | 203.2
Long-term debt |  | 1,910.9
Other liabilities |  | 410.8
Net assets acquired |  | 2,033.5
Less: Merger consideration |  | (1,402.8)
Bargain purchase gain |  | 630.7
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 | 259.4 |
Current portion of long-term debt | 203.2 |
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 |
Restatement Adjustment [Member] |  |
Assets: |  |
Cash and cash equivalents |  | 0.0
Accounts receivable |  | (6.9)
Other current assets |  | (2.6)
Long-term notes receivable from ARO |  | 0.0
Investment in ARO |  | 2.5
Property and equipment |  | (26.0)
Other assets |  | 1.1
Liabilities: |  |
Accounts payable and accrued liabilities |  | 15.7
Current portion of long-term debt |  | 0.0
Long-term debt |  | 0.0
Other liabilities |  | 34.5
Net assets acquired |  | (82.1)
Less: Merger consideration |  | 0.0
Bargain purchase gain |  | $ (82.1)

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