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Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, € in Millions | 1 Months Ended | 3 Months Ended | 12 Months Ended |  |  |  |  |
--- | --- | --- | --- | --- | --- | --- | --- | ---
Feb. 29, 2020 USD ($) | Jan. 31, 2020 USD ($) | Apr. 30, 2019 USD ($) | Apr. 30, 2019 EUR (€) | Apr. 30, 2018 USD ($) | Apr. 30, 2018 EUR (€) | Mar. 31, 2017 USD ($) | Mar. 31, 2017 EUR (€) | Sep. 30, 2019 USD ($) | Jun. 30, 2019 USD ($) | Sep. 30, 2018 USD ($) | Sep. 30, 2017 USD ($) | Dec. 31, 2019 USD ($) Office Country $ / shares shares | Dec. 31, 2018 USD ($) $ / shares shares | Dec. 31, 2017 USD ($) $ / shares shares | Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Dec. 31, 2013 | Aug. 31, 2019 shares | Mar. 31, 2019 | Jan. 01, 2019 USD ($) | Aug. 03, 2018 shares | Jul. 28, 2016 shares
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Number of offices worldwide (over) | Office |  |  |  |  |  |  |  |  |  |  |  |  | 2,500 |  |  |  |  |  |  |  |  |  |  |
Number of countries and territories | Country |  |  |  |  |  |  |  |  |  |  |  |  | 75 |  |  |  |  |  |  |  |  |  |  |
Investments value |  |  |  |  |  |  |  |  |  |  |  |  | $ 97,800,000 | $ 161,400,000 | $ 158,700,000 |  |  |  |  |  |  |  |  |
Unremitted earning from investments |  |  |  |  |  |  |  |  |  |  |  |  | $ 3,400,000 | 105,200,000 |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 44,500,000 | 42,800,000 |  |  |  |  |  |  |  |  |  |
Advertising expenses |  |  |  |  |  |  |  |  |  |  |  |  | 25,700,000 | 27,900,000 | 26,600,000 |  |  |  |  |  |  |  |  |
Restructuring costs |  |  |  |  |  |  |  |  |  |  |  |  | 42,000,000.0 | 39,300,000 | 34,500,000 |  |  |  |  |  |  |  |  |
Costs paid, utilized or transferred |  |  |  |  |  |  |  |  |  |  |  |  | 50,200,000 | 37,300,000 |  |  |  |  |  |  |  |  |  |
Balance at end of year |  |  |  |  |  |  |  |  |  |  |  |  | 7,300,000 | 15,500,000 | 13,500,000 |  |  |  |  |  |  |  |  |
Consolidated amortization expense related to intangibles |  |  |  |  |  |  |  |  |  |  |  |  | 29,800,000 | 35,100,000 | 34,600,000 |  |  |  |  |  |  |  |  |
2020 |  |  |  |  |  |  |  |  |  |  |  |  | 26,600,000 |  |  |  |  |  |  |  |  |  |  |
2021 |  |  |  |  |  |  |  |  |  |  |  |  | 16,200,000 |  |  |  |  |  |  |  |  |  |  |
2022 |  |  |  |  |  |  |  |  |  |  |  |  | 12,800,000 |  |  |  |  |  |  |  |  |  |  |
2023 |  |  |  |  |  |  |  |  |  |  |  |  | 10,000,000.0 |  |  |  |  |  |  |  |  |  |  |
2024 |  |  |  |  |  |  |  |  |  |  |  |  | 7,800,000 |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  | $ 0 |  | $ 0 | $ 0 | 64,000,000.0 |  |  |  |  |  |  |  |  |  |  |
Percentage interest acquired |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 51.00% |  |  |
Percentage of ownership in Swiss franchise |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 49.00% |  |  |
Swiss franchise investment portfolio market value |  |  |  |  |  |  |  |  |  |  |  |  |  | 219,900,000 |  |  |  |  |  |  |  |  |  |
Swiss franchise realized gains |  |  |  |  |  |  |  |  |  |  |  |  | 300,000 | 12,700,000 | 14,700,000 |  |  |  |  |  |  |  |  |
Swiss franchise realized losses |  |  |  |  |  |  |  |  |  |  |  |  | 200,000 | 2,100,000 | 3,800,000 |  |  |  |  |  |  |  |  |
Net capitalized software balance |  |  |  |  |  |  |  |  |  |  |  |  | 7,500,000 | 7,400,000 |  |  |  |  |  |  |  |  |  |
Amortization expense related to capitalized software cost |  |  |  |  |  |  |  |  |  |  |  |  | $ 2,000,000.0 | $ 1,500,000 | 1,300,000 |  |  |  |  |  |  |  |  |
Shares authorized to be repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000.0 |  |  | 6,000,000.0 | 6,000,000.0
Shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 2,400,000 | 5,700,000 |  |  |  |  |  |  |  |  |  |
Total cost of shares repurchased |  |  |  |  |  |  |  |  |  |  |  |  | $ 203,000,000.0 | $ 500,700,000 | $ 203,900,000 |  |  |  |  |  |  |  |  |
Dividends declared (in dollars per share) | $ / shares |  |  |  |  |  |  |  |  |  |  |  |  | $ 2.18 | $ 2.02 | $ 1.86 |  |  |  |  |  |  |  |  |
Total dividend payments |  |  |  |  |  |  |  |  |  |  |  |  | $ 129,300,000 | $ 127,300,000 | $ 123,700,000 |  |  |  |  |  |  |  |  |
Net earnings, net of tax, attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | $ (40,600,000) | $ 42,000,000.0 | $ 51,900,000 |  |  |  |  |  |  |  |  |
CICE payroll tax credit |  |  |  |  |  |  |  |  |  |  |  |  |  | 6.00% | 7.00% | 6.00% | 6.00% | 6.00% | 4.00% |  |  |  |  |
Multiplier for payroll tax credits |  |  |  |  |  |  |  |  |  |  |  |  | 2.5 |  |  |  |  |  |  |  |  |  |  |
Payment period |  |  |  |  |  |  |  |  |  |  |  |  | 3 years |  |  |  |  |  |  |  |  |  |  |
Net proceeds from sale of tax credits |  |  | $ 103,500,000 | € 92.0 | $ 234,500,000 | € 190.9 | $ 143,500,000 | € 133.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROU assets |  |  |  |  |  |  |  |  |  |  |  |  | $ 448,500,000 |  |  |  |  |  |  |  |  |  |  |
Lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  | 458,800,000 |  |  |  |  |  |  |  |  |  |  |
Unrecognized losses related to the pension plans |  |  |  |  |  |  |  |  |  |  |  |  | 7,400,000 |  |  |  |  |  |  |  |  |  |  |
United States Plans | Subsequent Event |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Payment for annuities |  | $ 19,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Settlement of lump sum payments | $ 3,000,000.0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ASU No. 2016-02 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
ROU assets |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 458,100,000 |  |
Lease liabilities |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  | $ 458,700,000 |  |
Noncontrolling Interests |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net earnings, net of tax, attributable to noncontrolling interests |  |  |  |  |  |  |  |  |  |  |  |  | $ (1,800,000) | $ 4,900,000 | $ (6,500,000) |  |  |  |  |  |  |  |  |
August 2019 Authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares remaining authorized for repurchase (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 6,000,000.0 |  |  |  |  |  |  |  |  |  |  |
August 2018 Authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,900,000 |  |  |  |  |  |  |  |  |  |
Shares remaining authorized for repurchase (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 800,000 |  |  |  |  |  |  |  |  |  |  |
July 2016 Authorization |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Shares repurchased (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  |  | 2,800,000 | 1,900,000 |  |  |  |  |  |  |  |  |
Shares remaining authorized for repurchase (in shares) | shares |  |  |  |  |  |  |  |  |  |  |  |  | 0 |  |  |  |  |  |  |  |  |  |  |
Leasehold Improvements |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | lesser of life of asset or expected lease term |  |  |  |  |  |  |  |  |  |  |
Northern Europe | Germany |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  | $ 60,200,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
APME | New Zealand |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Goodwill impairment charge |  |  |  |  |  |  |  |  |  | $ 3,800,000 |  |  |  |  |  |  |  |  |  |  |  |  |  |
Minimum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining lease terms |  |  |  |  |  |  |  |  |  |  |  |  | 1 month |  |  |  |  |  |  |  |  |  |  |
Minimum | Furniture, Fixtures, and Autos |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Minimum | Computer Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 2 years |  |  |  |  |  |  |  |  |  |  |
Minimum | Discount Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  |  |  |  |  |  | 0.099 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Maximum |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Remaining lease terms |  |  |  |  |  |  |  |  |  |  |  |  | 14 years |  |  |  |  |  |  |  |  |  |  |
Maximum | Buildings |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 40 years |  |  |  |  |  |  |  |  |  |  |
Maximum | Furniture, Fixtures, and Autos |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Maximum | Computer Equipment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Estimated useful lives |  |  |  |  |  |  |  |  |  |  |  |  | 15 years |  |  |  |  |  |  |  |  |  |  |
Maximum | Discount Rates |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Discount rate for goodwill impairment test (as a percent) |  |  |  |  |  |  |  |  | 0.131 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
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 |  |  |  |  |  |  |  |  |  |  |  |  | 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 |  |  |  |  |  |  |  |  |  |  |  |  | $ 1,062,500,000 | $ 1,052,900,000 |  |  |  |  |  |  |  |  |  |
Euro-denominated notes | Carrying value | Significant Other Observable Inputs (Level 2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Carrying value of long-term debt |  |  |  |  |  |  |  |  |  |  |  |  | 1,002,900,000 | 1,024,600,000 |  |  |  |  |  |  |  |  |  |
Allowance for doubtful accounts |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Accounting Policies [Line Items] |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Bad debt expense |  |  |  |  |  |  |  |  |  |  |  |  | 21,800,000 | 23,000,000.0 | $ 18,100,000 |  |  |  |  |  |  |  |  |
Write-offs |  |  |  |  |  |  |  |  |  |  |  |  | $ 19,100,000 | $ 12,000,000.0 | $ 17,600,000 |  |  |  |  |  |  |  |  |

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- Definition Accounting policies. + References No definition available. + Details
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- Definition Percentage to be applied to the eligible wages for calculation of the CICE payroll tax credit. + References No definition available. + Details
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- Definition Sum of interest income and expense, foreign exchange gains and losses and other miscellaneous non-operating income and expenses. + References No definition available. + Details
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- Definition Lessee, Operating Lease, Remaining Lease Term + References No definition available. + Details
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- Definition Multiplier to the French minimum wage for the purpose of determining eligibility for the French payroll tax credit. Credit d'Impot pur la Competitive et l'Emploi ("CICE"), French legislation, provides payroll tax credit on a percentage of wages paid to employees receiving less than this number times the French minimum wage. + References No definition available. + Details
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- Definition Net proceeds from sale of payroll tax credits. + References No definition available. + Details
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- Definition Number of countries and territories in which entity operates. + References No definition available. + Details
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- Definition Number of offices in which entity operates. + References No definition available. + Details
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- Definition The carry-forward period after which the remaining CICE payroll tax credit will be paid. + References No definition available. + Details
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