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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, $ in Millions | 3 Months Ended | 12 Months Ended |  |  |
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Dec. 31, 2022 USD ($) Office Country shares | Sep. 30, 2022 USD ($) | Sep. 30, 2021 USD ($) | Sep. 30, 2020 USD ($) | Dec. 31, 2022 USD ($) Office Country $ / shares shares | Dec. 31, 2021 USD ($) $ / shares shares | Dec. 31, 2020 USD ($) $ / shares shares | Aug. 31, 2021 shares | Aug. 31, 2019 shares | Aug. 31, 2018 shares
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of offices worldwide (over) | Office |  | 2,200 |  |  |  |  | 2,200 |  |  |  |  |  |  |
Number of countries and territories | Country |  | 75 |  |  |  |  | 75 |  |  |  |  |  |  |
Investments value |  | $ 95.8 |  |  |  |  | $ 95.8 |  | $ 114.2 |  |  |  |  |
Unremitted earning from investments |  |  |  |  |  |  | $ 4.3 |  | 11.8 |  |  |  |  |
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 |  | 35.6 |  |  |  |  | $ 35.6 |  | 34.8 |  |  |  |  |
Advertising expenses |  |  |  |  |  |  | 29.6 |  | 28.1 |  | $ 22.2 |  |  |
Restructuring costs |  |  |  |  |  |  | 3.6 |  | 15.2 |  | 110.7 |  |  |
Operating lease right-of-use asset impairment |  |  |  |  |  |  | 0.0 |  | 0.0 |  | 27.3 |  |  |
Costs paid, utilized or transferred |  |  |  |  |  |  | 13.7 |  | 38.0 |  |  |  |  |
Reserve will be paid by end of period |  | 13.2 |  |  |  |  | 13.2 |  | 23.3 |  | 46.1 |  |  |
Consolidated amortization expense related to intangibles | [1] |  |  |  |  |  | 37.1 |  | 24.2 |  | 27.2 |  |  |
2023 |  | 34.6 |  |  |  |  | 34.6 |  |  |  |  |  |  |
2024 |  | 32.2 |  |  |  |  | 32.2 |  |  |  |  |  |  |
2025 |  | 30.2 |  |  |  |  | 30.2 |  |  |  |  |  |  |
2026 |  | 26.7 |  |  |  |  | 26.7 |  |  |  |  |  |  |
2027 |  | 26.1 |  |  |  |  | 26.1 |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  | $ 0.0 | $ 0.0 | $ 0.0 | 50.0 | [2],[3] | 0.0 |  | 66.8 |  |  |
Goodwill | [2] | 1,628.1 | [4] |  |  |  | 1,628.1 | [4] | 1,722.2 | [4] | 1,225.8 |  |  |
Net capitalized software balance |  | $ 47.7 |  |  |  |  | 47.7 |  | 38.2 |  |  |  |  |
Amortization expense related to capitalized software cost |  |  |  |  |  |  | $ 9.8 |  | $ 5.5 |  | $ 1.8 |  |  |
Shares authorized to be repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  | 4,000,000.0 | 6,000,000.0 | 6,000,000.0
Shares repurchased (in shares) | shares |  |  |  |  |  |  | 3,200,000 |  |  |  | 3,400,000 |  |  |
Total cost of shares repurchased |  |  |  |  |  |  | $ 270.0 |  |  |  | $ 264.7 |  |  |
Dividends declared (in dollars per share) | $ / shares |  |  |  |  |  |  | $ 2.72 |  | $ 2.52 |  | $ 2.26 |  |  |
Total dividend payments |  |  |  |  |  |  | $ 139.9 |  | $ 136.6 |  | $ 129.1 |  |  |
Net earnings, net of tax, attributable to noncontrolling interests |  |  |  |  |  |  | 24.6 |  | 17.3 |  | 39.9 |  |  |
Cloud Computing Arrangements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Unamortized Implementation Costs |  |  |  |  |  |  | 19.9 |  |  |  |  |  |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings, net of tax, attributable to noncontrolling interests |  |  |  |  |  |  | $ 0.8 |  | $ 0.7 |  | $ 4.7 |  |  |
August 2019 Authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  |  | 1,200,000 |  | 2,100,000 |  | 2,600,000 |  |  |
Total cost of shares repurchased |  |  |  |  |  |  |  |  | $ 210.0 |  |  |  |  |
Shares remaining authorized for repurchase (in shares) | shares |  | 0 |  |  |  |  | 0 |  |  |  |  |  |  |
August 2018 Authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |
Shares remaining authorized for repurchase (in shares) | shares |  | 0 |  |  |  |  | 0 |  |  |  |  |  |  |
August 2021 Authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  |  | 2,000,000.0 |  |  |  |  |  |  |
Shares remaining authorized for repurchase (in shares) | shares |  | 2,000,000.0 |  |  |  |  | 2,000,000.0 |  |  |  |  |  |  |
Buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | 40 years |  |  |  |  |  |  |
Leasehold Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  | lesser of life of asset or expected lease term |  |  |  |  |  |  |
Netherlands |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  |  |  |  |  |  | $ 50.0 |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  | 1.25 |  |  |  |  |  |  |  |  |  |
Netherlands | Discount Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 1.35 |  |  |  |  | 1.35 |  |  |  |  |  |  |
Netherlands | Terminal Value Revenue Growth Rate |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 0.20 |  | 0.20 |  |  | 0.20 |  |  |  |  |  |  |
Netherlands | Terminal Value OUP Margin |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 0.40 |  | 0.40 |  |  | 0.40 |  |  |  |  |  |  |
Northern Europe | Netherlands |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill, Impairment Loss |  | $ 50.0 |  |  |  |  |  |  |  |  |  |  |  |
Goodwill |  | $ 55.1 |  |  |  |  | $ 55.1 |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of goodwill over fair value of reporting unit |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |
Remaining lease terms |  | 1 month |  |  |  |  | 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 | Netherlands |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  | 0.30 |  |  |  |  |  |  |  |  |  |
Minimum | Netherlands | Revenue Growth |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 0.00 |  |  |  |  | 0.00 |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining lease terms |  | 11 years |  |  |  |  | 11 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 | Netherlands |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  | 0.84 |  |  |  |  |  |  |  |  |  |
Maximum | Netherlands | Revenue Growth |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  | 0.30 |  |  |  |  | 0.30 |  |  |  |  |  |  |
Customer relationships |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  | 14 years |  |  |  |  |  |  |
Other |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  | 4 years |  |  |  |  |  |  |
Computer software | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |
Computer software | Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Useful life |  |  |  |  |  |  | 0 years |  |  |  |  |  |  |
Other Reporting Units | Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Percentage of goodwill over fair value of reporting unit |  |  |  |  |  |  | 20.00% |  |  |  |  |  |  |
Euro-denominated notes | Estimate of fair value measurement | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of long-term debt |  | $ 921.7 |  |  |  |  | $ 921.7 |  | 1,064.0 |  |  |  |  |
Euro-denominated notes | Carrying value | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of long-term debt |  | $ 956.6 |  |  |  |  | $ 956.6 |  | $ 1,019.6 |  |  |  |  |
[1] | (b) Intangible asset amortization related to acquisitions is excluded from operating costs within the reportable segments and corporate expenses, and shown separately.
[2] | Balances were net of accumulated impairment loss of $644.2 ($127.0 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, 2021 and December 31, 2021; and $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.
[3] | The 2022 impairment charge of $50.0 relates to our Netherlands reporting unit, which was recorded during the fourth quarter of 2022. See Note 1 to the Consolidated Financial Statements for further information.
[4] | Balances were net of accumulated impairment loss of $694.2 and $644.2 as of December 31, 2022 and 2021, respectively.

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