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Property and Equipment Property and Equipment (Schedule of Property and Equipment) (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2020
USD ($)
floater
Mar. 31, 2020
$ / bbl
Sep. 30, 2019
USD ($)
Sep. 30, 2020
USD ($)
rigs
$ / bbl
Sep. 30, 2019
USD ($)
Jun. 30, 2020
USD ($)
Dec. 31, 2019
USD ($)
Property, Plant and Equipment [Line Items]              
PROPERTY AND EQUIPMENT, AT COST $ 13,215.5     $ 13,215.5     $ 18,393.8
Loss on impairment $ 0.0   $ 88.2 $ 3,646.2 $ 90.7    
Number of Rigs Impaired | floater 2            
Oil and Gas, Average Sale Price | $ / bbl   60   20      
Impairment of Long-Lived Assets to be Disposed of $ 0.0     $ 15.0      
Number Of Rigs Held-for-Sale | rigs       3      
Assets Held-for-sale, Not Part of Disposal Group 4.6     $ 4.6      
Drilling rigs and equipment              
Property, Plant and Equipment [Line Items]              
PROPERTY AND EQUIPMENT, AT COST 12,552.2     12,552.2     17,714.0
Work-in-progress              
Property, Plant and Equipment [Line Items]              
PROPERTY AND EQUIPMENT, AT COST 473.3     473.3     473.6
Other              
Property, Plant and Equipment [Line Items]              
PROPERTY AND EQUIPMENT, AT COST 190.0     190.0     $ 206.2
Floaters, Jackups And Spare Equipment              
Property, Plant and Equipment [Line Items]              
Loss on impairment       3,600.0      
Property, Plant, and Equipment, Fair Value Disclosure           $ 72.3  
Floaters And Spare Equipment              
Property, Plant and Equipment [Line Items]              
Impairment of Long-Lived Assets Held-for-use 817.3            
Property, Plant, and Equipment, Fair Value Disclosure $ 69.0     $ 69.0