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Property, Plant and Equipment, Net (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended 11 Months Ended 12 Months Ended
Feb. 02, 2021
Dec. 31, 2021
Dec. 31, 2022
Dec. 31, 2020
Jun. 30, 2022
Feb. 03, 2021
Property, Plant and Equipment [Line Items]            
Leasehold Improvements, Gross   $ 7.2 $ 7.1      
Depreciation and depletion expense     87.6      
Depreciation and depletion related to assets held for sale $ 7.8 $ 209.7   $ 108.0    
Property, Plant and Equipment, useful life   36 months        
Asset Retirement Costs     11.1   $ 38.2  
Gain recognized from changes in cost and timing     17.4      
Fully Depreciated Assets            
Property, Plant and Equipment [Line Items]            
Depreciation     167.5      
Assets, Fair Value Disclosure           $ 197.5
Oil and Gas Properties [Member]            
Property, Plant and Equipment [Line Items]            
Asset Retirement Costs     $ 11.1