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Summary of Acquisitions (Details) - USD ($)
$ in Millions
12 Months Ended
Dec. 13, 2013
Oct. 18, 2013
May. 17, 2013
Dec. 31, 2015
Business Combination Segment Allocation [Line Items]        
Total purchase price       $ 2,695.0
Debt assumed       (898.8)
Purchase price less debt       1,796.2
Working capital adjustments       (2.2)
Adjusted purchase price       1,794.0
Carrying value of net assets / (liabilities) acquired       487.4
Excess of sales price over net assets acquired       $ 1,306.6
Tender Rig T15        
Business Combination Segment Allocation [Line Items]        
Total purchase price     $ 210.0  
Debt assumed     (100.5)  
Purchase price less debt     109.5  
Working capital adjustments     (34.9)  
Adjusted purchase price     74.6  
Carrying value of net assets / (liabilities) acquired     (4.8)  
Excess of sales price over net assets acquired     $ 79.4  
Tender Rig T16        
Business Combination Segment Allocation [Line Items]        
Total purchase price   $ 200.0    
Debt assumed   (93.1)    
Purchase price less debt   106.9    
Working capital adjustments   (39.0)    
Adjusted purchase price   67.9    
Carrying value of net assets / (liabilities) acquired   0.3    
Excess of sales price over net assets acquired   $ 67.6    
West Sirius | Seadrill Capricorn Holdings LLC        
Business Combination Segment Allocation [Line Items]        
Total purchase price $ 1,035.0      
Debt assumed (220.2)      
Purchase price less debt 814.8      
Working capital adjustments 106.7      
Adjusted purchase price 921.5      
Carrying value of net assets / (liabilities) acquired 374.6      
Excess of sales price over net assets acquired 546.9      
West Leo | Seadrill Operating LP        
Business Combination Segment Allocation [Line Items]        
Total purchase price 1,250.0      
Debt assumed (485.0)      
Purchase price less debt 765.0      
Working capital adjustments (35.0)      
Adjusted purchase price 730.0      
Carrying value of net assets / (liabilities) acquired 117.3      
Excess of sales price over net assets acquired $ 612.7