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Discontinued Operations (Narrative) (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2018
USD ($)
rigs
Dec. 31, 2017
USD ($)
Dec. 31, 2016
USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Discontinued Operations, Income Tax Expense (Benefit), Discrete Item | $ $ (6.9) $ 2.1 $ 10.2
Document Period End Date Dec. 31, 2018    
Jackup Rigs [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number Of Contract Drilling Rigs Sold 12    
Semisubmersible Rigs [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number Of Contract Drilling Rigs Sold 5    
Moored Semisubmersible Rigs [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number Of Contract Drilling Rigs Sold 1    
Ultra Deepwater Drillships [Member]      
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]      
Number Of Contract Drilling Rigs Sold 2