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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions		12 Months Ended
		Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Disaggregation of Revenue [Line Items]
Revenue	[1]	$ 19,827.5	$ 20,724.4	$ 18,001.0
Intercompany Eliminations
Disaggregation of Revenue [Line Items]
Revenue		(80.1)	(37.7)
Americas
Disaggregation of Revenue [Line Items]
Revenue		4,935.7	4,263.7	3,792.4
Americas | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		4,787.2	4,162.5
Americas | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		148.5	101.2
Americas | United States
Disaggregation of Revenue [Line Items]
Revenue		3,499.3	2,743.3
Americas | United States | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		3,380.9	2,663.9
Americas | United States | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		118.4	79.4
Americas | Other Americas
Disaggregation of Revenue [Line Items]
Revenue		1,436.4	1,520.4
Americas | Other Americas | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		1,406.3	1,498.6
Americas | Other Americas | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		30.1	21.8
Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		8,536.3	9,346.8	7,855.2
Southern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		8,385.5	9,212.3
Southern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		150.8	134.5
Southern Europe | France
Disaggregation of Revenue [Line Items]
Revenue		4,785.0	5,171.3
Southern Europe | France | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		4,732.3	5,122.4
Southern Europe | France | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		52.7	48.9
Southern Europe | Italy
Disaggregation of Revenue [Line Items]
Revenue		1,706.9	1,795.4
Southern Europe | Italy | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		1,659.4	1,752.8
Southern Europe | Italy | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		47.5	42.6
Southern Europe | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		2,044.4	2,380.1
Southern Europe | Other Southern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		1,993.8	2,337.1
Southern Europe | Other Southern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		50.6	43.0
Northern Europe
Disaggregation of Revenue [Line Items]
Revenue		4,048.3	4,670.5
Northern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		3,902.9	4,545.0
Northern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		145.4	125.5
APME
Disaggregation of Revenue [Line Items]
Revenue		2,387.3	2,481.1	2,376.7
APME | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		2,302.4	2,401.1
APME | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		84.9	80.0
Northern Europe And APME
Disaggregation of Revenue [Line Items]
Revenue		19,907.6	20,762.1	$ 18,001.0
Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue		19,907.6	20,762.1
Reportable Segments | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue		19,378.0	20,320.9
Reportable Segments | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue		529.6	441.2
Staffing and Interim | Americas
Disaggregation of Revenue [Line Items]
Revenue		4,191.8	3,722.4
Staffing and Interim | Americas | United States
Disaggregation of Revenue [Line Items]
Revenue		2,862.5	2,292.1
Staffing and Interim | Americas | Other Americas
Disaggregation of Revenue [Line Items]
Revenue		1,329.3	1,430.3
Staffing and Interim | Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		7,657.5	8,405.7
Staffing and Interim | Southern Europe | France
Disaggregation of Revenue [Line Items]
Revenue		4,421.8	4,765.1
Staffing and Interim | Southern Europe | Italy
Disaggregation of Revenue [Line Items]
Revenue		1,600.7	1,695.6
Staffing and Interim | Southern Europe | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		1,635.0	1,945.0
Staffing and Interim | Northern Europe
Disaggregation of Revenue [Line Items]
Revenue		3,567.4	4,191.4
Staffing and Interim | APME
Disaggregation of Revenue [Line Items]
Revenue		1,809.6	1,886.6
Staffing and Interim | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue		17,226.3	18,206.1
Outcome-Based Solutions and Consulting | Americas
Disaggregation of Revenue [Line Items]
Revenue		326.2	200.8
Outcome-Based Solutions and Consulting | Americas | United States
Disaggregation of Revenue [Line Items]
Revenue		274.3	154.9
Outcome-Based Solutions and Consulting | Americas | Other Americas
Disaggregation of Revenue [Line Items]
Revenue		51.9	45.9
Outcome-Based Solutions and Consulting | Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		636.6	733.1
Outcome-Based Solutions and Consulting | Southern Europe | France
Disaggregation of Revenue [Line Items]
Revenue		268.0	329.8
Outcome-Based Solutions and Consulting | Southern Europe | Italy
Disaggregation of Revenue [Line Items]
Revenue		31.9	33.9
Outcome-Based Solutions and Consulting | Southern Europe | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		336.7	369.4
Outcome-Based Solutions and Consulting | Northern Europe
Disaggregation of Revenue [Line Items]
Revenue		215.0	255.5
Outcome-Based Solutions and Consulting | APME
Disaggregation of Revenue [Line Items]
Revenue		392.0	408.1
Outcome-Based Solutions and Consulting | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue		1,569.8	1,597.5
Permanent Recruitment | Americas
Disaggregation of Revenue [Line Items]
Revenue		257.6	182.3
Permanent Recruitment | Americas | United States
Disaggregation of Revenue [Line Items]
Revenue		209.0	147.8
Permanent Recruitment | Americas | Other Americas
Disaggregation of Revenue [Line Items]
Revenue		48.6	34.5
Permanent Recruitment | Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		171.6	151.7
Permanent Recruitment | Southern Europe | France
Disaggregation of Revenue [Line Items]
Revenue		57.9	53.5
Permanent Recruitment | Southern Europe | Italy
Disaggregation of Revenue [Line Items]
Revenue		51.7	45.6
Permanent Recruitment | Southern Europe | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		62.0	52.6
Permanent Recruitment | Northern Europe
Disaggregation of Revenue [Line Items]
Revenue		179.3	145.9
Permanent Recruitment | APME
Disaggregation of Revenue [Line Items]
Revenue		149.1	143.2
Permanent Recruitment | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue		757.6	623.1
Other | Americas
Disaggregation of Revenue [Line Items]
Revenue		160.1	158.2
Other | Americas | United States
Disaggregation of Revenue [Line Items]
Revenue		153.5	148.5
Other | Americas | Other Americas
Disaggregation of Revenue [Line Items]
Revenue		6.6	9.7
Other | Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		70.6	56.3
Other | Southern Europe | France
Disaggregation of Revenue [Line Items]
Revenue		37.3	22.9
Other | Southern Europe | Italy
Disaggregation of Revenue [Line Items]
Revenue		22.6	20.3
Other | Southern Europe | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue		10.7	13.1
Other | Northern Europe
Disaggregation of Revenue [Line Items]
Revenue		86.6	77.7
Other | APME
Disaggregation of Revenue [Line Items]
Revenue		36.6	43.2
Other | Reportable Segments
Disaggregation of Revenue [Line Items]
Revenue		$ 353.9	$ 335.4
[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.

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