Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2023 USD ($) reporting_unit	Dec. 31, 2022 USD ($)
Accounting Policies [Abstract]
Restricted cash	$ 7.5	$ 7.5
Interest trade receivable percentage	100.00%
Disposal group, including discontinued operation, accounts, notes and loans receivable, net	$ 60.0	65.0
Accounts payable, third party programs	$ 105.0	$ 80.0
Number of reporting units | reporting_unit	7