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Fair Value Measurements - Narrative (Details) - USD ($) $ in Millions		3 Months Ended				6 Months Ended
	Feb. 15, 2022	Jul. 03, 2022	Apr. 03, 2022	Jul. 04, 2021	Apr. 04, 2021	Jul. 03, 2022	Jul. 04, 2021	Mar. 07, 2022	Feb. 14, 2022	Jan. 02, 2022	Mar. 08, 2021
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Payment for contingent consideration liability, financing activities						$ 0.7	$ 0.0
Equity securities without readily determinable fair value, with changes in fair value in net income		$ 6.4				6.4
Proceeds from sale of equity security						196.9	$ 0.0
Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase to indemnification liability		0.8				0.8
Indemnification liabilities, expense (income)						0.1
Brazil | Maximum
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification liabilities		8.8				8.8
Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Increase to indemnification liability		0.7
Payment for contingent consideration liability, financing activities			$ 0.7
RocketPower
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration								$ 0.6
Contingent consideration, maximum		$ 31.8				$ 31.8		$ 31.8
Persol Holdings Investment
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Cost of equity securities										$ 18.0
Proceeds from sale of equity security	$ 196.9
Business Talent Group, LLC
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Proceeds from sale of equity security				$ 5.0
Kenzie Academy Inc.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity securities without readily determinable fair value, with changes in fair value in net income											$ 1.4
Debt and equity securities, realized gain (loss)					$ (1.4)
PersolKelly Pte. Ltd.
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Equity method investment, ownership percentage		2.50%				2.50%			49.00%
Equity securities without readily determinable fair value, with changes in fair value in net income		$ 6.4				$ 6.4
Other Assets
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Money market funds		7.3				7.3				6.5
Level 3 | Brazil
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Indemnification liability		3.3				3.3				2.4
Level 3 | Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration		3.0				3.0				4.6
Payment for contingent consideration liability			$ 2.3
Level 3 | RocketPower
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration		0.6				0.6
Level 3 | Other Long Term Liabilities | Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration										2.3
Level 3 | Other Long Term Liabilities | RocketPower
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration		0.1				0.1
Level 3 | Accounts Payable and Accrued Liabilities | Greenwood/Asher
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration										$ 2.3
Level 3 | Accounts Payable and Accrued Liabilities | RocketPower
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Contingent consideration		$ 0.5				$ 0.5

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