Income Taxes (Summary of Operating and Capital Loss Carryforwards) (Details) $ in Millions	Sep. 30, 2022 USD ($)
U.S. State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 279.5
Capital loss carryforwards	36.3
U.S. Federal
Operating Loss Carryforwards [Line Items]
Capital loss carryforwards	88.8
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	268.8
Capital loss carryforwards	$ 181.1