Consolidated Statements of Operations (Unaudited) - USD ($) shares in Millions, $ in Millions		3 Months Ended				9 Months Ended
		Sep. 30, 2023		Sep. 30, 2022		Sep. 30, 2023		Sep. 30, 2022
Income Statement [Abstract]
Revenues from services	[2]	$ 4,675.6	[1]	$ 4,800.9	[1]	$ 14,284.0	[3]	$ 15,018.3	[3]
Cost of services		3,853.7		3,922.4		11,736.7		12,321.5
Gross profit		821.9		878.5		2,547.3		2,696.8
Selling and administrative expenses		752.1		717.0		2,252.0		2,215.9
Operating profit		69.8		161.5		295.3		480.9
Interest and other expenses, net		15.1		4.7		34.4		14.1
Earnings before income taxes		54.7		156.8		260.9		466.8
Provision for income taxes		24.4		45.5		87.6		141.7
Net earnings		$ 30.3		$ 111.3		$ 173.3		$ 325.1
Net earnings per share - basic		$ 0.61		$ 2.15		$ 3.46		$ 6.18
Net earnings per share - diluted		$ 0.6		$ 2.13		$ 3.42		$ 6.1
Weighted-average common shares outstanding - basic		49.5		51.7		50.1		52.6
Weighted average shares - diluted		50.1		52.3		50.7		53.3

[1] Certain service line revenues for the United States and Northern Europe were reclassified for the 2022 comparative period to align with the current period presentation. In the United States, $58.4 was reclassified from Outcome-Based Solutions and Consulting to Staffing and Interim. In Northern Europe, $24.8 was reclassified from Staffing and Interim to Outcome-Based Solutions and Consulting.

[2] Our consolidated revenues from services include fees received from our franchise offices of $3.8 and $4.4 for the three months ended September 30, 2023 and 2022, respectively, and $11.0 and $11.9 for the nine months ended September 30, 2023 and 2022, respectively. These fees are primarily based on revenues generated by the franchise offices, which were $243.5 and $264.0 for the three months ended September 30, 2023 and 2022, respectively, and $744.3 and $804.8 for the nine months ended September 30, 2023 and 2022, respectively.

[3] Certain service line revenues for the United States and Northern Europe were reclassified for the 2022 comparative period to align with the current period presentation. In the United States, $171.6 was reclassified from Outcome-Based Solutions and Consulting to Staffing and Interim. In Northern Europe, $90.0 was reclassified from Staffing and Interim to Outcome-Based Solutions and Consulting.