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Summary of Significant Accounting Policies - Additional Information (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2025 USD ($) Office Country | Dec. 31, 2024 USD ($) | Dec. 31, 2023 USD ($)
Accounting Policies [Line Items] |  |  |  |  |  |
Number of offices worldwide (over) | Office | 2,100 |  |  |  |  |
Number of countries and territories | Country | 70 |  |  |  |  |
Investments value | $ 100.2 |  | $ 103.9 |  |  |
Unremitted earning from investments | $ 6.5 |  | 16.9 |  |  |
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 | $ 45.6 |  | 30.3 |  |  |
Exceeded fair value | 10.00% |  |  |  |  |
Advertising expenses | $ 28.1 |  | 28.3 |  | $ 28.9 |
Costs paid, utilized or transferred | 72.9 |  | 93.7 |  |  |
Reserve will be paid by end of period | 35.1 |  |  |  |  |
Consolidated amortization expense related to intangibles | 31.3 | [1] | 32.7 | [2] | 34.6 | [3]
2026 | 27.9 |  |  |  |  |
2027 | 27.1 |  |  |  |  |
2028 | 27.1 |  |  |  |  |
2029 | 26.8 |  |  |  |  |
2030 | 26.3 |  |  |  |  |
Goodwill, Impairment Loss | 88.7 | [4] | 0.0 |  | 55.1 |
Goodwill | 1,544.6 | [5],[6] | 1,563.4 | [5],[6] | 1,586.8 |
Net capitalized software balance | $ 39.3 |  | 36.5 |  |  |
Asset Impairment Charges |  |  |  |  | 2.2 |
Property, Plant, and Equipment, Useful Life, Term, Description [Extensible Enumeration] | Property, Plant and Equipment, Net |  |  |  |  |
Costs paid or utilized | $ 72.9 |  | 93.7 |  |  |
Restructuring reserve | 35.1 |  |  |  |  |
Cloud Computing Arrangements |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Unamortized Implementation Costs | $ 166.5 |  | $ 110.8 |  | 54.6 |
Buildings |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives | 40 years |  |  |  |  |
Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Remaining lease terms | 1 month |  |  |  |  |
Minimum | Furniture, Fixtures, and Autos |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives | 3 years |  |  |  |  |
Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Remaining lease terms | 14 years |  |  |  |  |
Maximum | Computer Equipment |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Estimated useful lives | 16 years |  |  |  |  |
Customer relationships |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Useful life | 15 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 | $ 1,645.3 |  | $ 928.5 |  |  |
Euro-denominated notes | Carrying value | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Carrying value of long-term debt | 1,639.0 |  | 928.4 |  |  |
Selling and Administrative Expenses |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Net restructuring costs | 64.2 |  | 53.6 |  | 149.2 |
Amortization expense related to capitalized software cost | $ 17.2 |  | $ 15.8 |  | $ 13.8 |
North America | Terminal Value OUP Margin |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 5.00% |  |  |  |  |
United Kingdom |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Discount Rate | 11.40% |  |  |  |  |
Goodwill | $ 78.0 |  |  |  |  |
United Kingdom | Terminal Value OUP Margin |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 0.50% |  |  |  |  |
United Kingdom | Northern Europe |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Goodwill, Impairment Loss | $ 33.4 |  |  |  |  |
United Kingdom | Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 8.40% |  |  |  |  |
United Kingdom | Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 10.00% |  |  |  |  |
Switzerland |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Discount Rate | 11.20% |  |  |  |  |
Goodwill | $ 35.5 |  |  |  |  |
Switzerland | Terminal Value Revenue Growth Rate |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 3.00% |  |  |  |  |
Switzerland | Southern Europe |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Discount Rate | 13.70% |  |  |  |  |
Goodwill, Impairment Loss | $ 24.7 |  |  |  |  |
Asset Impairment Charges | $ 30.6 |  |  |  |  |
Switzerland | Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 12.00% |  |  |  |  |
Switzerland | Minimum | Terminal Value OUP Margin |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 1.00% |  |  |  |  |
Switzerland | Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 12.40% |  |  |  |  |
Switzerland | Maximum | Terminal Value OUP Margin |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 4.00% |  |  |  |  |
United States |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Discount Rate | 9.40% |  |  |  |  |
United States | Minimum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 1.70% |  |  |  |  |
United States | Maximum |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |
Revenue Growth Percentage | 8.00% |  |  |  |  |
[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 separat ely.
[3] | Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
[4] | Impairment charges for the year ended December 31, 2025 consist of a goodwill impairment related to our investments in Switzerland and the United Kingdom and an impairment of an indefinite-lived intangible asset in our Switzerland business.
[5] | Balances were net of accumulated impairment loss of $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 January 1, 2024 and December 31, 2024; and $807.4 ($24.7 related to Southern Europe, $265.5 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, 2025.
[6] | Balances were net of accumulated impairment loss of $807.4 and $749.3 as of December 31, 2025 and 2024, respectively.

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