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Income Taxes (Narrative) (Details)
$ in Millions
 1 Months Ended 3 Months Ended 12 Months Ended
Dec. 31, 2013
USD ($)
Dec. 31, 2015
USD ($)
Sep. 30, 2015
USD ($)
Jun. 30, 2015
USD ($)
Mar. 31, 2015
USD ($)
Dec. 31, 2014
USD ($)
Sep. 30, 2014
USD ($)
Jun. 30, 2014
USD ($)
Mar. 31, 2014
USD ($)
Dec. 31, 2015
USD ($)
jackup
Dec. 31, 2014
USD ($)
jackup
Dec. 31, 2013
USD ($)
jackup
Income Tax Expense (Benefit), Discrete Item                     $ 18.4  
Income from continuing operations before income taxes in the U.S. countries                   $ (578.2) (460.3) $ 173.4
Income from continuing operations before income taxes in the non-U.S. countries                   (893.0) (2,100.0) 1,500.0
Deferred tax assets related to U.S. foreign tax credits   $ 84.1       $ 98.6       84.1 98.6  
Deferred tax assets related to net operating loss carryforwards   228.7       204.5       228.7 204.5  
Net operating loss carryforwards   979.2               979.2    
Operating loss carryforwards, Not subject to expiration   599.0               599.0    
Operating loss carryforwards, Subject to expiration   380.2               380.2    
Valuation allowance on NOL carryforwards and FTC   259.8               259.8    
Valuation Allowance, Deferred Tax Asset, Change in Amount $ 7.0                 11.0 41.4  
Asset Impairment Charges   2,744.0 $ 2.4 $ 0.0 $ 0.0 3,515.2 $ 0.0 $ 703.5 $ 0.0 $ 2,746.4 $ 4,218.7 $ 0.0
Consilidated effective income tax rate excluding discrete items                   16.00% 10.70% 12.20%
Minimum percentage threshold for recognition of tax benefits                   50.00%    
Total unrecognized tax benefits 151.7 140.6       134.4       $ 140.6 $ 134.4 $ 151.7
Unrecognized Tax Benefits, Increase Resulting from Prior Period Tax Positions With Net Operating Loss Carryforwards                   21.3 18.5  
Amount of unrecognized tax benefits affecting the consolidated effective income tax rate if recognized   62.2       108.3       62.2 108.3  
Amount of accrued interest and penalties included in other liabilities   30.4       26.5       30.4 26.5  
Amount of interest and penalties recognized in net tax expense                   (3.9) 9.2 1.6
Income tax benefits, inclusive of interest and penalties due to lapses in statute of limitations 3.1 7.6       2.4       7.6 $ 2.4 $ 3.1
Decline in unrecognized tax benefits during next twelve months   64.9               64.9    
Accrued interest and penalty assessments related to the decline in unrecognized tax benefits   9.5               $ 9.5    
Number of assets transferred (in drillships or jackups) | jackup                   1 3 2
Income tax liability from gain on intercompany transfers   0.0               $ 0.0    
Unamortized deferred charges related to intercompany transfers   37.1       39.7       37.1 $ 39.7  
Amount included in current income taxes for amortization of deferred income taxes related to intercompany transfers                   2.6 2.6 $ 4.1
Deferred tax liability related to temporary difference from transferred drilling rigs $ 23.0 21.2               21.2   23.0
Tax benefits included in deferred income tax expense related to amortization of deferred reversing temporary differences from intercompany transfers                   1.8 1.8 1.9
Undistributed Earnings of Foreign Subsidiaries   2,300.0               2,300.0    
Other Liabilities [Member]                        
Total unrecognized tax benefits   $ 119.3       $ 115.9       $ 119.3 115.9  
Minimum [Member]                        
Deferred Tax Assets, Foreign, Expiration Date                   2022    
Operating loss carryforwards tax credits expiration year                   2016    
Maximum [Member]                        
Deferred Tax Assets, Foreign, Expiration Date                   2023    
Operating loss carryforwards tax credits expiration year                   2020    
Mexican Tax Authority [Member]                        
Deferred Tax Liabilities, Gross                       7.4
Proceeds from Income Tax Refunds                       $ 30.6
Rig Impairments [Member]                        
Income Tax Expense (Benefit), Discrete Item                   $ 192.5 $ 16.4