Revenue (Tables)

12 Months Ended

Dec. 31, 2023

Revenue from Contract with Customer [Abstract]

Disaggregation of Revenue

The following table presents our segment revenues disaggregated by service type (in millions of dollars):

	December Year to Date
	2023		2022		2021
Professional & Industrial
Staffing services	$	1,029.0	$	1,228.2	$	1,402.4
Permanent placement	12.9		28.9		24.7
Outcome-based services	441.2		409.1		410.3
Total Professional & Industrial	1,483.1		1,666.2		1,837.4
Science, Engineering & Technology
Staffing services	792.7		869.0		813.2
Permanent placement	17.8		29.7		24.4
Outcome-based services	380.3		366.7		319.2
Total Science, Engineering & Technology	1,190.8		1,265.4		1,156.8
Education
Staffing services	834.9		627.8		411.5
Permanent placement	7.0		8.4		5.0
Total Education	841.9		636.2		416.5
Outsourcing & Consulting
Talent solutions	454.7		468.0		432.1
Total Outsourcing & Consulting	454.7		468.0		432.1
International
Staffing services	860.2		892.3		1,032.9
Permanent placement	21.8		22.6		21.3
Talent solutions	2.8		17.3		13.6
Total International	884.8		932.2		1,067.8
Total Intersegment	(19.6)		(2.6)		(0.9)
Total Revenue from Services	$	4,835.7	$	4,965.4	$	4,909.7

The below table presents our revenues disaggregated by geography (in millions of dollars):

	December Year to Date
	2023		2022		2021
Americas
United States	$	3,555.8	$	3,671.5	$	3,513.4
Canada	189.8		168.2		155.0
Puerto Rico	107.0		112.4		102.1
Mexico	75.7		46.5		92.7
Total Americas Region	3,928.3		3,998.6		3,863.2
Europe
Switzerland	224.2		222.8		222.2
France	194.4		199.4		223.1
Portugal	189.4		169.5		158.2
Italy	63.9		69.3		74.2
Russia	—		63.4		132.2
Other	191.8		200.3		197.1
Total Europe Region	863.7		924.7		1,007.0
Total Asia-Pacific Region	43.7		42.1		39.5
Total Kelly Services, Inc.	$	4,835.7	$	4,965.4	$	4,909.7

The below table presents our SET, OCG and International segment revenues disaggregated by geographic region (in millions of dollars):

	December Year to Date
	2023		2022		2021
Science, Engineering & Technology
Americas	$	1,175.2	$	1,250.3	$	1,149.3
Europe	15.6		15.1		7.5
Total Science, Engineering & Technology	$	1,190.8	$	1,265.4	$	1,156.8
Outsourcing & Consulting
Americas	$	375.0	$	403.3	$	369.4
Europe	36.0		22.6		23.2
Asia-Pacific	43.7		42.1		39.5
Total Outsourcing & Consulting	$	454.7	$	468.0	$	432.1
International
Americas	$	72.7	$	45.2	$	91.5
Europe	812.1		887.0		976.3
Total International	$	884.8	$	932.2	$	1,067.8