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Acquisition of Atwood (Narrative) (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Oct. 06, 2017
Sep. 30, 2018
Sep. 30, 2018
Dec. 31, 2017
May 26, 2017
Business Acquisition [Line Items]          
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Assets   $ (6.5) $ 1.8    
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   2.8 8.6    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill   $ 5.4 $ 5.4    
Finite-Lived Intangible Assets, Amortization Expense, Next Twelve Months       2.8  
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