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Acquisition Of Atwood Assets Acquired Liabilities Assumed (Details) - USD ($)
$ in Millions
 3 Months Ended 12 Months Ended
Oct. 06, 2017
Oct. 05, 2017
Dec. 31, 2017
Dec. 31, 2017
Dec. 31, 2016
Dec. 31, 2015
Liabilities:            
Repayment of Atwood debt   $ (1,305.9)        
Bargain purchase gain     $ 140.2 $ 140.2 $ 0.0 $ 0.0
Atwood Oceanics, Inc.            
Business Acquisition [Line Items]            
Business Combination, Acquired Receivables, Gross Contractual Amount $ 64.7          
Assets:            
Cash and cash equivalents 445.4          
Accounts Receivable 62.3          
Other current assets 118.1          
Property and equipment 1,762.0          
Other assets 23.7          
Liabilities:            
Accounts payable and accrued liabilities 64.9          
Other liabilities 118.7          
Net assets acquired 2,227.9          
Merger consideration $ (770.7) $ (781.8)