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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