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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2022	Sep. 30, 2021	Sep. 30, 2022	Sep. 30, 2021
Disaggregation of Revenue [Line Items]
Revenue	$ 4,800.9	$ 5,140.6	$ 15,018.3	$ 15,342.1
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Revenue	(19.7)	(17.4)	(55.0)	(17.4)
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,239.8	997.6	3,753.7	3,044.8
Americas | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,200.8	969.8	3,636.3	2,976.8
Americas | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	39.0	27.8	117.4	68.0
Americas | United States
Disaggregation of Revenue [Line Items]
Revenue	886.6	644.9	2,679.9	1,882.5
Americas | United States | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	855.7	623.2	2,585.5	1,829.6
Americas | United States | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	30.9	21.7	94.4	52.9
Americas | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	353.2	352.7	1,073.8	1,162.3
Americas | Other Americas | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	345.1	346.6	1,050.8	1,147.2
Americas | Other Americas | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	8.1	6.1	23.0	15.1
Americas | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	1,055.7	853.8	3,207.1	2,659.6
Americas | Staffing and Interim | United States
Disaggregation of Revenue [Line Items]
Revenue	730.2	525.0	2,212.8	1,562.1
Americas | Staffing and Interim | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	325.5	328.8	994.3	1,097.5
Americas | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	77.6	58.7	225.1	141.9
Americas | Outcome-Based Solutions and Consulting | United States
Disaggregation of Revenue [Line Items]
Revenue	64.6	46.1	187.6	108.4
Americas | Outcome-Based Solutions and Consulting | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	13.0	12.6	37.5	33.5
Americas | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	67.4	50.1	203.7	124.5
Americas | Permanent Recruitment | United States
Disaggregation of Revenue [Line Items]
Revenue	54.4	40.4	166.6	100.8
Americas | Permanent Recruitment | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	13.0	9.7	37.1	23.7
Americas | Other
Disaggregation of Revenue [Line Items]
Revenue	39.1	35.0	117.8	118.8
Americas | Other | United States
Disaggregation of Revenue [Line Items]
Revenue	37.4	33.4	112.9	111.2
Americas | Other | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	1.7	1.6	4.9	7.6
Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	2,039.8	2,382.6	6,435.1	6,965.3
Southern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	2,005.7	2,349.8	6,318.6	6,865.9
Southern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	34.1	32.8	116.5	99.4
Southern Europe | France
Disaggregation of Revenue [Line Items]
Revenue	1,159.5	1,317.0	3,590.1	3,852.7
Southern Europe | France | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,147.8	1,305.5	3,548.2	3,815.5
Southern Europe | France | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	11.7	11.5	41.9	37.2
Southern Europe | Italy
Disaggregation of Revenue [Line Items]
Revenue	395.1	456.4	1,294.4	1,328.3
Southern Europe | Italy | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	385.0	446.3	1,258.3	1,297.9
Southern Europe | Italy | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	10.1	10.1	36.1	30.4
Southern Europe | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	485.2	609.2	1,550.6	1,784.3
Southern Europe | Other Southern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	472.9	598.0	1,512.1	1,752.5
Southern Europe | Other Southern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	12.3	11.2	38.5	31.8
Southern Europe | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	1,835.4	2,154.2	5,775.0	6,260.6
Southern Europe | Staffing and Interim | France
Disaggregation of Revenue [Line Items]
Revenue	1,071.8	1,220.0	3,323.2	3,545.1
Southern Europe | Staffing and Interim | Italy
Disaggregation of Revenue [Line Items]
Revenue	372.8	432.4	1,214.5	1,257.3
Southern Europe | Staffing and Interim | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	390.8	501.8	1,237.3	1,458.2
Southern Europe | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	145.6	178.9	482.8	551.8
Southern Europe | Outcome-Based Solutions and Consulting | France
Disaggregation of Revenue [Line Items]
Revenue	61.9	79.6	200.5	249.7
Southern Europe | Outcome-Based Solutions and Consulting | Italy
Disaggregation of Revenue [Line Items]
Revenue	6.7	8.7	24.0	24.6
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	77.0	90.6	258.3	277.5
Southern Europe | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	39.3	37.7	132.1	111.9
Southern Europe | Permanent Recruitment | France
Disaggregation of Revenue [Line Items]
Revenue	12.9	12.7	45.8	40.5
Southern Europe | Permanent Recruitment | Italy
Disaggregation of Revenue [Line Items]
Revenue	11.1	11.0	39.3	32.5
Southern Europe | Permanent Recruitment | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	15.3	14.0	47.0	38.9
Southern Europe | Other
Disaggregation of Revenue [Line Items]
Revenue	19.5	11.8	45.2	41.0
Southern Europe | Other | France
Disaggregation of Revenue [Line Items]
Revenue	12.9	4.7	20.6	17.4
Southern Europe | Other | Italy
Disaggregation of Revenue [Line Items]
Revenue	4.5	4.3	16.6	13.9
Southern Europe | Other | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	2.1	2.8	8.0	9.7
Northern Europe
Disaggregation of Revenue [Line Items]
Revenue	954.1	1,166.6	3,075.7	3,490.9
Northern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	919.4	1,135.1	2,965.3	3,402.0
Northern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	34.7	31.5	110.4	88.9
Northern Europe | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	840.1	1,049.3	2,717.4	3,135.7
Northern Europe | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	51.3	62.4	159.0	193.8
Northern Europe | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	42.9	37.0	135.2	102.6
Northern Europe | Other
Disaggregation of Revenue [Line Items]
Revenue	19.8	17.9	64.1	58.8
APME
Disaggregation of Revenue [Line Items]
Revenue	586.9	611.2	1,808.8	1,858.5
APME | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	565.3	590.5	1,742.9	1,796.7
APME | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	21.6	20.7	65.9	61.8
APME | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	447.8	461.2	1,366.5	1,407.5
APME | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	91.8	103.7	299.9	304.2
APME | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	38.0	36.0	115.7	113.2
APME | Other
Disaggregation of Revenue [Line Items]
Revenue	9.3	10.3	26.7	33.6
Northern Europe and APME
Disaggregation of Revenue [Line Items]
Revenue	4,820.6	5,158.0	15,073.3	15,359.5
Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue	4,820.6	5,158.0	15,073.3	15,359.5
Reportable Segments | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	4,691.2	5,045.2	14,663.1	15,041.4
Reportable Segments | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	129.4	112.8	410.2	318.1
Reportable Segments | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	4,179.0	4,518.5	13,066.0	13,463.4
Reportable Segments | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	366.3	403.7	1,166.8	1,191.7
Reportable Segments | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	187.6	160.8	586.7	452.2
Reportable Segments | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 87.7	$ 75.0	$ 253.8	$ 252.2

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