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Summary of Significant Accounting Policies (Narrative) (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) reporting_unit	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Jan. 01, 2020 USD ($)
Variable Interest Entity [Line Items]
Restricted cash	$ 8.0	$ 8.0
Interest trade receivable percentage	100.00%
Disposal group, including discontinued operation, accounts, notes and loans receivable, net	$ 55.0	35.0
Allowance for doubtful accounts	39.0	37.0	$ 42.0
Retained earnings	(3,046.0)	(2,973.0)
Accounts payable, third party programs	$ 80.0	$ 130.0
Number of reporting units | reporting_unit	7
Accounting Standards Update 2016-13
Variable Interest Entity [Line Items]
Allowance for doubtful accounts				$ 3.3
Retained earnings				$ 2.5

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