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Acquisition Of Atwood Assets Acquired Liabilities Assumed (Details) - USD ($)
$ in Millions
 3 Months Ended
Oct. 06, 2017
Mar. 31, 2018
Mar. 31, 2017
Liabilities [Abstract]      
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Net Assets   $ 16.6  
Payments For Business Acquisition, Acquired Entity Liabilities $ (1,305.9)    
Gain on bargain purchase (156.8) (16.6) $ 0.0
Atwood Oceanics, Inc. [Member]      
Assets [Abstract]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 445.4    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Cash And Cash Equivalents   0.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 62.3    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Receivable   0.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 125.0    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Current Assets   6.9  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 1,768.9    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Property, Plant, and Equipment   6.9  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 23.9    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Assets   0.2  
Liabilities [Abstract]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 62.3    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Accounts Payable And Accrued Liabilities   (2.6)  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other 118.7    
Business Combination, Provisional Information, Initial Accounting Incomplete, Adjustment, Other Liabilities   $ 0.0  
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 2,244.5    
Business Combination, Consideration Transferred (781.8)    
Scenario, Previously Reported [Member]      
Liabilities [Abstract]      
Payments For Business Acquisition, Acquired Entity Liabilities (1,305.9)    
Gain on bargain purchase (140.2)    
Scenario, Previously Reported [Member] | Atwood Oceanics, Inc. [Member]      
Assets [Abstract]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents 445.4    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Receivables 62.3    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Assets, Other 118.1    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Property, Plant, and Equipment 1,762.0    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Other Noncurrent Assets 23.7    
Liabilities [Abstract]      
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Current Liabilities, Accounts Payable 64.9    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Noncurrent Liabilities, Other 118.7    
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net 2,227.9    
Business Combination, Consideration Transferred $ (781.8)