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Quarterly Data (Unaudited) (Parenthetical) (Details) - USD ($) $ in Millions |  |  | 1 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | --- | --- | ---
Sep. 29, 2023 | Jan. 17, 2022 | Nov. 30, 2021 | Sep. 30, 2023 | Sep. 30, 2022 | Sep. 30, 2021 | Dec. 31, 2023 | [1],[2] | Dec. 31, 2022 | Dec. 31, 2021
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
Impairment Charge |  |  |  | $ 0.0 | $ 0.0 | $ 0.0 | $ 55.1 | $ 50.0 | [1],[2] | $ 0.0
One-time loss on disposition |  | $ (8.0) |  |  | $ (4.1) |  |  | (2.1) |  |
Selling and Administrative Expenses |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
One-time loss on disposition | $ (1.3) | (9.7) | $ (1.2) |  |  |  |  | (0.9) |  |
Interest and Other Expenses (Income), Net |  |  |  |  |  |  |  |  |  |
Quarterly Financial Information Disclosure [Line Items] |  |  |  |  |  |  |  |  |  |
One-time loss on disposition |  | $ (1.7) |  |  |  |  |  | $ (1.2) |  |
[1] | Balances were net of accumulated impairment loss of $694.2 ($177.0 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to Corporate) as of December 31, 2022; and $749.3 ($232.1 related to Northern Europe, $3.8 related to APME, $235.2 related to Right Management and $278.2 related to Corporate) as of December 31, 2023.
[2] | The impairment charges relate to our Netherlands reporting unit, which was recorded during the fourth quarter of 2022 and 2023, respectively. See Note 1 to the Consolidated Financial Statements for further information.

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