Revenue Recognition (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

In the following table, revenue is disaggregated by service types and timing of revenue recognition and includes a reconciliation of the disaggregated revenues by reportable segment.

	Year Ended December 31,
	2023											2022(a)
	Staffing and Interim		Outcome- Based Solutions and Consulting		Permanent Recruitment		Other		Total			Staffing and Interim		Outcome- Based Solutions and Consulting		Permanent Recruitment		Other		Total
Americas:
United States	$	2,647.7	$	18.3	$	133.0	$	162.6	$	2,961.6		$	3,115.1	$	21.7	$	209.0	$	153.5	$	3,499.3
Other Americas		1,347.4		49.4		46.9		9.5		1,453.2			1,329.3		51.9		48.6		6.6		1,436.4
		3,995.1		67.7		179.9		172.1		4,414.8			4,444.4		73.6		257.6		160.1		4,935.7
Southern Europe:
France		4,454.7		283.5		58.9		70.0		4,867.1			4,421.8		268.0		57.9		37.3		4,785.0
Italy		1,590.1		36.9		55.0		26.8		1,708.8			1,600.7		31.9		51.7		22.6		1,706.9
Other Southern Europe		1,547.2		305.1		58.9		28.2		1,939.4			1,635.0		336.7		62.0		10.7		2,044.4
		7,592.0		625.5		172.8		125.0		8,515.3			7,657.5		636.6		171.6		70.6		8,536.3
Northern Europe		3,160.2		332.5		153.2		102.1		3,748.0			3,446.9		335.5		179.3		86.6		4,048.3
APME		1,781.8		386.3		109.4		44.8		2,322.3			1,809.6		392.0		149.1		36.6		2,387.3
		16,529.1		1,412.0		615.3		444.0		19,000.4			17,358.4		1,437.7		757.6		353.9		19,907.6
Intercompany Eliminations										(85.9	)										(80.1	)
Total									$	18,914.5										$	19,827.5

(a)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, $252.6 was reclassified from Outcome-Based Solutions and Consulting to Staffing and Interim. In Northern Europe, $120.5 was reclassified from Staffing and Interim to Outcome-Based Solutions and Consulting.

	Year Ended December 31,
	2023							2022
	Services transferred over time		Services transferred at a point in time		Total			Services transferred over time		Services transferred at a point in time		Total
Americas:
United States	$	2,885.0	$	76.6	$	2,961.6		$	3,380.9	$	118.4	$	3,499.3
Other Americas		1,423.6		29.6		1,453.2			1,406.3		30.1		1,436.4
		4,308.6		106.2		4,414.8			4,787.2		148.5		4,935.7
Southern Europe:
France		4,814.5		52.6		4,867.1			4,732.3		52.7		4,785.0
Italy		1,657.8		51.0		1,708.8			1,659.4		47.5		1,706.9
Other Southern Europe		1,891.1		48.3		1,939.4			1,993.8		50.6		2,044.4
		8,363.4		151.9		8,515.3			8,385.5		150.8		8,536.3
Northern Europe		3,627.5		120.5		3,748.0			3,902.9		145.4		4,048.3
APME		2,255.2		67.1		2,322.3			2,302.4		84.9		2,387.3
		18,554.7		445.7		19,000.4			19,378.0		529.6		19,907.6
Intercompany Eliminations						(85.9	)						(80.1	)
Total					$	18,914.5						$	19,827.5