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Inventories (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended			6 Months Ended	12 Months Ended	36 Months Ended
Inventories (Narrative) (Details) - USD ($) $ in Millions	Dec. 31, 2022	Jun. 30, 2022	Mar. 31, 2022	Jun. 30, 2022	Dec. 31, 2021	Dec. 31, 2020	Sep. 30, 2021
Inventory, Net [Abstract]
Separative work units borrowed in period, value	$ 10.4	$ 8.5	$ 9.4			$ 20.7
Separative work units repaid in period, value					$ 3.1
Separative work units valuation change in period	$ 2.4			$ 5.5	$ 4.8
Separative work units owed to others noncurrent							$ 25.5