Summary of Significant Accounting Policies - Additional Information (Details) $ / shares in Units, € in Millions		1 Months Ended				3 Months Ended					12 Months Ended
	Jan. 17, 2022 USD ($)	Apr. 30, 2019 USD ($)	Apr. 30, 2019 EUR (€)	Apr. 30, 2018 USD ($)	Apr. 30, 2018 EUR (€)	Sep. 30, 2021 USD ($)	Sep. 30, 2020 USD ($)	Jun. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Jun. 30, 2019 USD ($)	Dec. 31, 2021 USD ($) Office Country $ / shares shares	Dec. 31, 2020 USD ($) $ / shares shares	Dec. 31, 2019 USD ($) $ / shares shares	Dec. 31, 2018 USD ($)	Dec. 31, 2017 USD ($)	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013	Aug. 31, 2021 shares	Aug. 31, 2019 shares	Mar. 31, 2019	Aug. 31, 2018 shares
Accounting Policies [Line Items]
Number of offices worldwide (over) | Office											2,200
Number of countries and territories | Country											75
Investments value											$ 114,200,000	$ 106,600,000	$ 97,800,000
Unremitted earning from investments											$ 11,800,000	8,000,000.0
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											$ 34,800,000	34,900,000
Advertising expenses											28,100,000	22,200,000	25,700,000
Restructuring costs											15,200,000	110,700,000	42,000,000.0
Operating lease right-of-use asset impairment											0	27,300,000
Costs paid, utilized or transferred											38,000,000.0	71,900,000
Reserve will be paid by end of period											23,300,000	46,100,000	7,300,000
Consolidated amortization expense related to intangibles											24,200,000	27,200,000	29,800,000
2022											37,600,000
2023											34,200,000
2024											32,000,000.0
2025											30,000,000.0
2026											26,200,000
Goodwill, Impairment Loss						$ 0	$ 0		$ 0		0	66,800,000	64,000,000.0
Goodwill											1,722,200,000	1,225,800,000	1,260,100,000
Percentage of ownership in Swiss franchise																						49.00%
Swiss franchise investment portfolio market value														$ 219,900,000
Net capitalized software balance											38,200,000	19,200,000
Amortization expense related to capitalized software cost											$ 5,500,000	$ 1,800,000	$ 2,000,000.0
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											2.1	3,400,000	2,400,000
Total cost of shares repurchased											$ 210,000,000.0	$ 264,700,000	$ 203,000,000.0
Dividends declared (in dollars per share) | $ / shares											$ 2.52	$ 2.26	$ 2.18
Total dividend payments											$ 136,600,000	$ 129,100,000	$ 129,300,000
Net earnings, net of tax, attributable to noncontrolling interests											$ 17,300,000	$ 39,900,000	(40,600,000)
CICE payroll tax credit														6.00%	7.00%	6.00%	6.00%	6.00%	4.00%
Multiplier for payroll tax credits											0.025	2.5
Payment period											3 years
Net proceeds from sale of tax credits		$ 103,500,000	€ 92.0	$ 234,500,000	€ 190.9
Change in accounting principle, accounting standards update, adopted												true
Change in accounting principle, accounting standards update, immaterial effect												true
Manpower Switzerland
Accounting Policies [Line Items]
Percentage interest acquired																						51.00%
Accounting Standards Update 2020-01
Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted											true
Change in accounting principle, accounting standards update, adoption date											Jan. 01, 2021
Change in accounting principle, accounting standards update, immaterial effect											true
Accounting Standards Update 2019-11
Accounting Policies [Line Items]
Change in accounting principle, accounting standards update, adopted											true
Change in accounting principle, accounting standards update, adoption date											Jan. 01, 2021
Change in accounting principle, accounting standards update, immaterial effect											true
Noncontrolling Interests
Accounting Policies [Line Items]
Net earnings, net of tax, attributable to noncontrolling interests											$ 700,000	$ 4,700,000	$ (1,800,000)
August 2019 Authorization
Accounting Policies [Line Items]
Shares repurchased (in shares) | shares												2,600,000
Shares remaining authorized for repurchase (in shares) | shares											1,200,000
August 2018 Authorization
Accounting Policies [Line Items]
Shares repurchased (in shares) | shares												800,000
Shares remaining authorized for repurchase (in shares) | shares											0
August 2021 Authorization
Accounting Policies [Line Items]
Shares remaining authorized for repurchase (in shares) | shares											4,000,000.0
Buildings
Accounting Policies [Line Items]
Estimated useful lives											0 years
Leasehold Improvements
Accounting Policies [Line Items]
Estimated useful lives											lesser of life of asset or expected lease term
Netherlands
Accounting Policies [Line Items]
Percentage of goodwill over fair value of reporting unit											5.50%
Netherlands | Discount Rates
Accounting Policies [Line Items]
Discount rate for goodwill impairment test (as a percent)											0.104
Netherlands | Terminal Value Revenue Growth Rate
Accounting Policies [Line Items]
Discount rate for goodwill impairment test (as a percent)											0.020
Netherlands | Terminal Value OUP Margin
Accounting Policies [Line Items]
Discount rate for goodwill impairment test (as a percent)											0.035
Northern Europe | Russia
Accounting Policies [Line Items]
Disposed Segment	$ 4,000,000.0
Cash proceeds received	$ 3,200,000
Deferred consideration															$ 800,000
Anticipate recognizing a one-time loss on disposition															$ 8,000,000.0
Northern Europe | Netherlands
Accounting Policies [Line Items]
Goodwill											$ 112,200,000	$ 119,300,000
Northern Europe | Germany
Accounting Policies [Line Items]
Goodwill, Impairment Loss								$ 66,800,000		$ 60,200,000
APME | New Zealand
Accounting Policies [Line Items]
Goodwill, Impairment Loss										$ 3,800,000
Minimum
Accounting Policies [Line Items]
Percentage of goodwill over fair value of reporting unit											20.00%
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 | Netherlands
Accounting Policies [Line Items]
Discount rate for goodwill impairment test (as a percent)											0.030
Maximum
Accounting Policies [Line Items]
Remaining lease terms											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)											0.050
Customer relationships
Accounting Policies [Line Items]
Useful life											14 years
Other
Accounting Policies [Line Items]
Useful life											3 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											$ 1,064,000,000.0	1,159,100,000
Euro-denominated notes | Carrying value | Significant Other Observable Inputs (Level 2)
Accounting Policies [Line Items]
Carrying value of long-term debt											$ 1,019,600,000	$ 1,094,500,000