CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2023		Dec. 31, 2022		Dec. 31, 2021
Income Statement [Abstract]
Revenues from services	[1]	$ 18,914.5		$ 19,827.5		$ 20,724.4
Cost of services		15,556.5		16,255.1		17,316.9
Gross profit		3,358.0		3,572.4		3,407.5
Selling and administrative expenses, excluding goodwill impairment charges		3,047.1		2,940.7		2,822.1
Goodwill impairment charges		55.1	[2],[3]	50.0	[2],[3]	0.0
Selling and administrative expenses		3,102.2		2,990.7		2,822.1
Operating profit		255.8		581.7		585.4
Interest and other expenses, net		49.9		24.6		17.3
Earnings before income taxes		205.9		557.1		568.1
Provision for income taxes		117.1		183.3		185.7
Net earnings		$ 88.8		$ 373.8		$ 382.4
Net earnings per share - basic		$ 1.78		$ 7.17		$ 7.01
Net earnings per share - diluted		$ 1.76		$ 7.08		$ 6.91
Weighted average shares - basic		49.8		52.2		54.5
Weighted average shares - diluted		50.4		52.8		55.4

[1] (a) The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $11.9, $12.8 and $12.8 for 2023, 2022, and 2021, respectively.

[2] Balances were net of accumulated impairment loss of $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; and $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 December 31, 2023.

[3] The impairment charges relate to our Netherlands reporting unit, which was recorded during the fourth quarter of 2022 and 2023, respectively. See Note 1 to the Consolidated Financial Statements for further information.