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Property and Equipment (Schedule of Property and Equipment) (Details) - USD ($)
$ in Millions
Sep. 30, 2022
Dec. 31, 2021
Property, Plant and Equipment [Line Items]    
PROPERTY AND EQUIPMENT, AT COST $ 1,087.1 $ 957.0
Drilling rigs and equipment    
Property, Plant and Equipment [Line Items]    
PROPERTY AND EQUIPMENT, AT COST 990.1 886.9
Work-in-progress    
Property, Plant and Equipment [Line Items]    
PROPERTY AND EQUIPMENT, AT COST 58.9 35.6
Other    
Property, Plant and Equipment [Line Items]    
PROPERTY AND EQUIPMENT, AT COST $ 38.1 $ 34.5