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Summary of Significant Accounting Policies - Schedule of Goodwill, Finite-Lived Intangible Assets and Indefinite-Lived Intangible Assets (Details) - USD ($) $ in Millions | Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
--- | --- | --- | ---
Goodwill [Line Items] |  |  |  |  |  |
Goodwill | [2] | $ 1,586.8 | [1] | $ 1,628.1 | [1] | $ 1,722.2
Finite-lived: |  |  |  |  |  |
Gross |  | 846.4 |  | 840.2 |  |
Accumulated Amortization |  | 507.2 |  | 468.3 |  |
Net |  | 339.2 |  | 371.9 |  |
Indefinite-lived: |  |  |  |  |  |
Gross |  | 180.4 |  | 177.6 |  |
Total intangible assets |  |  |  |  |  |
Gross |  | 1,026.8 |  | 1,017.8 |  |
Accumulated Amortization |  | 507.2 |  | 468.3 |  |
Net |  | 519.6 |  | 549.5 |  |
Tradenames |  |  |  |  |  |
Indefinite-lived: |  |  |  |  |  |
Gross | [3] | 52.0 |  | 52.0 |  |
Reacquired franchise rights |  |  |  |  |  |
Indefinite-lived: |  |  |  |  |  |
Gross |  | 128.4 |  | 125.6 |  |
Customer relationships |  |  |  |  |  |
Finite-lived: |  |  |  |  |  |
Gross |  | 824.9 |  | 818.9 |  |
Accumulated Amortization |  | 486.0 |  | 448.1 |  |
Net |  | 338.9 |  | 370.8 |  |
Other |  |  |  |  |  |
Finite-lived: |  |  |  |  |  |
Gross |  | 21.5 |  | 21.3 |  |
Accumulated Amortization |  | 21.2 |  | 20.2 |  |
Net |  | $ 0.3 |  | $ 1.1 |  |
[1] | Balances were net of accumulated impairment loss of $749.3 and $694.2 as of December 31, 2023 and 2022, respectively.
[2] | 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.
[3] | Balances were net of accumulated impairment loss of $139.5 as of both December 31, 2023 and 2022.

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