Income Taxes (Summary of Operating and Capital Loss Carryforwards) (Details) $ in Millions	Sep. 30, 2019 USD ($)
U.S. State
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	$ 296.3
U.S. Federal
Operating Loss Carryforwards [Line Items]
Capital loss carryforwards	1.8
Foreign
Operating Loss Carryforwards [Line Items]
Operating loss carryforwards	352.6
Capital loss carryforwards	$ 262.5