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Inventories (Narrative) (Details) - USD ($)
$ in Millions
 12 Months Ended 36 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Sep. 30, 2021
Inventory, Net [Abstract]      
Separative work units borrowed in period, value   $ 20.7  
Separative work units repaid in period, value $ 3.1    
Separative work units valuation change in period 4.8    
Separative work units owed to others noncurrent $ 22.4   $ 25.5