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Acquisition Of Atwood Assets Acquired Liabilities Assumed (Details) - USD ($) $ in Millions |  |  | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | ---
Oct. 06, 2017 | Oct. 05, 2017 | Sep. 30, 2018 | Dec. 31, 2018 | Sep. 30, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Liabilities: |  |  |  |  |  |  |
Repayment of Atwood debt(2) |  | $ (1,305.9) | $ (1,305.9) |  |  |  |
Bargain purchase gain |  |  | 142.0 | $ 1.8 |  | $ 140.2 | $ 0.0
Atwood Oceanics, Inc. |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Payments to extinguish acquiree liabilities |  | 1,300.0 |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount | $ 64.7 |  |  |  |  |  |
Assets: |  |  |  |  |  |  |
Cash and cash equivalents | 445.4 |  | 445.4 |  | $ 445.4 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash And Cash Equivalents |  |  |  |  | 0.0 |  |
Accounts Receivable | 62.3 |  | 60.7 |  | 60.7 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable |  |  |  |  | (1.6) |  |
Other current assets | 118.1 |  | 122.7 |  | 122.7 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets |  |  |  |  | 4.6 |  |
Property and equipment | 1,762.0 |  | 1,771.2 |  | 1,771.2 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment |  |  |  |  | 9.2 |  |
Other assets | 23.7 |  | 18.6 |  | 18.6 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets |  |  |  |  | (5.1) |  |
Liabilities: |  |  |  |  |  |  |
Accounts payable and accrued liabilities | 64.9 |  | 63.8 |  | 63.8 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable And Accrued Liabilities |  |  |  |  | (1.1) |  |
Other liabilities | 118.7 |  | 125.1 |  | 125.1 |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities |  |  |  |  | 6.4 |  |
Net assets acquired | 2,227.9 |  | 2,229.7 |  | 2,229.7 |  |
Merger consideration | (770.7) | $ (781.8) | $ (781.8) |  |  |  |
Bargain purchase gain | $ 140.2 |  |  |  | $ 1.8 |  |

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