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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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