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Impairment (Details)
$ in Millions
 3 Months Ended 9 Months Ended
Sep. 30, 2015
USD ($)
rigs
Sep. 30, 2014
USD ($)
Sep. 30, 2015
USD ($)
rigs
Sep. 30, 2014
USD ($)
Jun. 30, 2015
rigs
Dec. 31, 2014
USD ($)
rigs
May. 31, 2014
rigs
Asset Impairment Charges [Abstract]              
Impairment of Long-Lived Assets Held-for-use       $ 991.5      
Loss on impairment $ 2.4 $ 0.0 $ 2.4 703.5      
Long Lived Assets Held-for-sale [Line Items]              
Disposal Group, Including Discontinued Operation, Property, Plant and Equipment, Current $ 127.5   $ 127.5     $ 152.4  
Number Of Rigs Committed To Be Sold | rigs 7   7   6   5
Floaters [Member]              
Asset Impairment Charges [Abstract]              
Loss on impairment       703.5      
Long Lived Assets Held-for-sale [Line Items]              
Number Of Rigs Committed To Be Sold | rigs           6  
Discontinued Operations [Member]              
Long Lived Assets Held-for-sale [Line Items]              
Impairment of Long-Lived Assets to be Disposed of $ 25.6   $ 32.8 546.4      
ENSCO DS-2 [Member] | Discontinued Operations [Member]              
Long Lived Assets Held-for-sale [Line Items]              
Impairment of Long-Lived Assets to be Disposed of       $ 288.0