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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, 2024
Dec. 31, 2023
Dec. 31, 2022
Goodwill [Line Items]      
Goodwill $ 1,563.4 [1],[2] $ 1,586.8 [1],[2] $ 1,628.1
Finite-lived:      
Gross 838.6 846.4  
Accumulated Amortization 530.4 507.2  
Net 308.2 339.2  
Indefinite-lived:      
Gross 177.9 180.4  
Total intangible assets      
Gross 1,016.5 1,026.8  
Accumulated Amortization 530.4 507.2  
Net 486.1 519.6  
Tradenames      
Indefinite-lived:      
Gross [3] 52.0 52.0  
Reacquired franchise rights      
Indefinite-lived:      
Gross 125.9 128.4  
Customer relationships      
Finite-lived:      
Gross 814.2 824.9  
Accumulated Amortization 509.1 486.0  
Net 305.1 338.9  
Other      
Finite-lived:      
Gross 24.4 21.5  
Accumulated Amortization 21.3 21.2  
Net $ 3.1 $ 0.3  
[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 January 1, 2023; 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 both December 31, 2023 and 2024.
[2] Balances were net of accumulated impairment loss of $749.3 as of both December 31, 2024 and 2023.
[3] Balances were net of accumulated impairment loss of $139.5 as of both December 31, 2024 and 2023.