CONSOLIDATED STATEMENTS OF OPERATIONS - USD ($) shares in Millions, $ in Millions		12 Months Ended
		Dec. 31, 2022		Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenues from services	[1]	$ 19,827.5		$ 20,724.4	$ 18,001.0
Cost of services		16,255.1		17,316.9	15,176.3
Gross profit		3,572.4		3,407.5	2,824.7
Selling and administrative expenses, excluding goodwill impairment charges		2,940.7		2,822.1	2,570.3
Goodwill impairment charges		50.0	[2],[3]	0.0	66.8
Selling and administrative expenses		2,990.7		2,822.1	2,637.1
Operating profit		581.7		585.4	187.6
Interest and other expenses, net		24.6		17.3	39.9
Earnings before income taxes		557.1		568.1	147.7
Provision for income taxes		183.3		185.7	123.9
Net earnings		$ 373.8		$ 382.4	$ 23.8
Net earnings per share - basic		$ 7.17		$ 7.01	$ 0.41
Net earnings per share - diluted		$ 7.08		$ 6.91	$ 0.41
Weighted average shares - basic		52.2		54.5	58.0
Weighted average shares - diluted		52.8		55.4	58.3

[1] (a) The United States revenues above represent revenues from our company-owned branches and franchise fees received from our franchise operations, which were $12.8, $12.8 and $12.6 for 2022, 2021 and 2020, respectively.

[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.