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West Vela (Summary of Acquisition Transaction) (Details) - USD ($)
$ in Millions
12 Months Ended
Nov. 04, 2014
Dec. 31, 2015
Dec. 31, 2014
Consideration      
Cash   $ 1,796.2  
Working capital adjustments   (2.2)  
Fair value of total consideration transferred   1,794.0  
Recognized amounts of identifiable assets acquired and liabilities assumed at estimated fair value      
Goodwill   $ 3.2 $ 3.2
West Vela      
Consideration      
Cash $ 467.0    
Mobilization payable 73.7    
Contingent consideration 65.7    
Working capital adjustments (6.0)    
Fair value of total consideration transferred 600.4    
Recognized amounts of identifiable assets acquired and liabilities assumed at estimated fair value      
Cash 1.9    
Current assets 61.4    
Intangible asset - favorable drilling contract 204.7    
Drilling unit 755.8    
Non current assets 61.8    
Long term interest bearing debt (433.1)    
Current liabilities (52.3)    
Total identifiable net assets 600.2    
Goodwill 0.2    
Total $ 600.4