Income Taxes (Summary of Operating and Capital Loss Carryforwards) (Details) $ in Millions	Sep. 30, 2020 USD ($)
U.S. State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 323.2
U.S. Federal
Operating Loss Carryforwards [Line Items]
Capital loss carryforwards	24.4
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	236.6
Capital loss carryforwards	$ 274.8