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Acquisition of Atwood (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |  |
--- | --- | --- | --- | --- | --- | ---
Oct. 05, 2017 | Jun. 30, 2018 | Jun. 30, 2018 | Dec. 31, 2017 | Oct. 06, 2017 | May 26, 2017
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Assets |  | $ 8.3 | $ 8.3 |  |  |
Business Combination, Intangible Liability, Due to Unfavorable Drilling Contracts |  |  |  | $ 60.0 |  |
Atwood |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  |  |  |  | $ 445.4 |
Repayments of Debt | $ 1,300.0 |  |  |  |  |
Business Combination, Acquired Receivables, Gross Contractual Amount |  |  |  |  | $ 64.7 |
Finite-lived Intangible Assets Acquired |  |  |  | 30.1 |  |
Amortization of Intangible Assets |  | $ 4.3 | $ 5.8 |  |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  |  |  | 8.2 |  |
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months |  |  |  | 5.6 |  |
Finite-Lived Intangible Assets, Amortization Expense, Year Two |  |  |  | $ 2.6 |  |
Atwood | Class A ordinary shares, U.S. |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |
Share Price |  |  |  |  |  | $ 6.70
Shares Issued, Price Per Share | $ 5.83 |  |  |  |  |

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