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Summary of Significant Accounting Policies - Additional Information (Details)
$ in Millions
 12 Months Ended
Dec. 31, 2024
USD ($)
Country
Office
Dec. 31, 2023
USD ($)
Dec. 31, 2022
USD ($)
Jun. 30, 2024
USD ($)
Accounting Policies [Line Items]        
Number of offices worldwide (over) | Office 2,100      
Number of countries and territories | Country 75      
Investments value $ 103.9 $ 102.2    
Unremitted earning from investments $ 16.9 11.5    
Payment terms 60 days      
Description of timing Our client contracts are generally short-term in nature with a term of one year or less. The timing between satisfaction of the performance obligation, invoicing and payment is not significant.      
Deferred revenue $ 30.3 31.9    
Advertising expenses 28.3 28.9 $ 29.6  
Costs paid, utilized or transferred 93.7 72.4    
Reserve will be paid by end of period 46.5      
Consolidated amortization expense related to intangibles 32.7 [1] 34.6 [2] 37.1 [3]  
2025 31.0      
2026 27.5      
2027 26.9      
2028 26.9      
2029 26.5      
Goodwill, Impairment Loss $ 0.0 55.1 [4] 50.0  
Percentage of goodwill over fair value of reporting unit 15.00%      
Goodwill $ 1,563.4 [5],[6] 1,586.8 [5],[6] 1,628.1  
Indefinite-Lived Franchise Rights       $ 27.7
Net capitalized software balance $ 36.5 44.7    
Asset Impairment Charges   2.2    
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] Property, Plant and Equipment, Net      
Cloud Computing Arrangements        
Accounting Policies [Line Items]        
Unamortized Implementation Costs $ 110.8 $ 54.6 19.9  
Buildings        
Accounting Policies [Line Items]        
Estimated useful lives 40 years      
Switzerland        
Accounting Policies [Line Items]        
Indefinite - lived intangible asset impairment test 5.20%      
Discount rate for goodwill impairment test (as a percent) 0.131      
Minimum        
Accounting Policies [Line Items]        
Remaining lease terms 1 month      
Minimum | Furniture, Fixtures, and Autos        
Accounting Policies [Line Items]        
Estimated useful lives 3 years      
Minimum | Computer Equipment        
Accounting Policies [Line Items]        
Estimated useful lives   3 years    
Minimum | Switzerland        
Accounting Policies [Line Items]        
Discount rate for goodwill impairment test (as a percent) 0.023      
Maximum        
Accounting Policies [Line Items]        
Remaining lease terms 15 years      
Maximum | Furniture, Fixtures, and Autos        
Accounting Policies [Line Items]        
Estimated useful lives 16 years      
Maximum | Computer Equipment        
Accounting Policies [Line Items]        
Estimated useful lives   16 years    
Maximum | Switzerland        
Accounting Policies [Line Items]        
Discount rate for goodwill impairment test (as a percent) 0.055      
Customer relationships        
Accounting Policies [Line Items]        
Useful life 14 years 5 years    
Computer software | Minimum        
Accounting Policies [Line Items]        
Useful life 3 years      
Computer software | Maximum        
Accounting Policies [Line Items]        
Useful life 10 years      
Euro-denominated notes | Estimate of fair value measurement | Significant Other Observable Inputs (Level 2)        
Accounting Policies [Line Items]        
Carrying value of long-term debt $ 928.5 $ 977.6    
Euro-denominated notes | Carrying value | Significant Other Observable Inputs (Level 2)        
Accounting Policies [Line Items]        
Carrying value of long-term debt 928.4 988.2    
Selling and Administrative Expenses        
Accounting Policies [Line Items]        
Net restructuring costs 53.6 149.2 3.6  
Amortization expense related to capitalized software cost 15.8 $ 13.8 $ 9.8  
North America        
Accounting Policies [Line Items]        
Goodwill $ 1,243.0      
[1] Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
[2] Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
[3] Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately
[4] The impairment charge relates to our Netherlands reporting unit, which was recorded during the fourth quarter 2023. See Note 1 to the Consolidated Financial Statements for further information.
[5] 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.
[6] Balances were net of accumulated impairment loss of $749.3 as of both December 31, 2024 and 2023.