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Revenue Recognition - Disaggregation of Revenue (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Disaggregation of Revenue [Line Items]
Revenue	$ 5,373.1	$ 5,656.9	$ 10,418.0	$ 11,179.3
Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	5,252.9	5,529.8	10,184.2	10,930.8
Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	120.2	127.1	233.8	248.5
Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	4,759.7	5,019.4	9,212.1	9,915.5
Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	369.3	379.1	728.1	757.6
Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	158.9	166.7	308.0	326.6
Other
Disaggregation of Revenue [Line Items]
Revenue	85.2	91.7	169.8	179.6
Americas
Disaggregation of Revenue [Line Items]
Revenue	1,043.4	1,052.5	2,050.7	2,075.1
Americas | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,025.4	1,034.5	2,015.7	2,040.9
Americas | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	18.0	18.0	35.0	34.2
Americas | United States
Disaggregation of Revenue [Line Items]
Revenue	630.9	640.5	1,234.5	1,256.8
Americas | United States | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	617.2	626.7	1,207.8	1,231.1
Americas | United States | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	13.7	13.8	26.7	25.7
Americas | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	412.5	412.0	816.2	818.3
Americas | Other Americas | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	408.2	407.8	807.9	809.8
Americas | Other Americas | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	4.3	4.2	8.3	8.5
Americas | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	944.1	951.4	1,858.2	1,882.8
Americas | Staffing and Interim | United States
Disaggregation of Revenue [Line Items]
Revenue	551.3	559.1	1,080.0	1,102.3
Americas | Staffing and Interim | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	392.8	392.3	778.2	780.5
Americas | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	45.4	46.9	88.1	87.4
Americas | Outcome-Based Solutions and Consulting | United States
Disaggregation of Revenue [Line Items]
Revenue	33.1	34.6	64.1	63.9
Americas | Outcome-Based Solutions and Consulting | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	12.3	12.3	24.0	23.5
Americas | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	30.3	30.9	59.0	58.7
Americas | Permanent Recruitment | United States
Disaggregation of Revenue [Line Items]
Revenue	24.1	24.4	47.0	46.2
Americas | Permanent Recruitment | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	6.2	6.5	12.0	12.5
Americas | Other
Disaggregation of Revenue [Line Items]
Revenue	23.6	23.3	45.4	46.2
Americas | Other | United States
Disaggregation of Revenue [Line Items]
Revenue	22.4	22.4	43.4	44.4
Americas | Other | Other Americas
Disaggregation of Revenue [Line Items]
Revenue	1.2	0.9	2.0	1.8
Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	2,387.2	2,434.0	4,489.4	4,746.0
Southern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	2,351.5	2,398.6	4,418.7	4,675.1
Southern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	35.7	35.4	70.7	70.9
Southern Europe | France
Disaggregation of Revenue [Line Items]
Revenue	1,420.2	1,512.5	2,721.6	2,936.5
Southern Europe | France | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,407.5	1,498.5	2,695.2	2,908.1
Southern Europe | France | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	12.7	14.0	26.4	28.4
Southern Europe | Italy
Disaggregation of Revenue [Line Items]
Revenue	394.0	443.0	749.9	856.6
Southern Europe | Italy | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	384.2	433.5	730.7	838.4
Southern Europe | Italy | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	9.8	9.5	19.2	18.2
Southern Europe | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	573.0	478.5	1,017.9	952.9
Southern Europe | Other Southern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	559.8	466.6	992.8	928.6
Southern Europe | Other Southern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	13.2	11.9	25.1	24.3
Southern Europe | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	2,182.8	2,234.5	4,084.3	4,344.8
Southern Europe | Staffing and Interim | France
Disaggregation of Revenue [Line Items]
Revenue	1,345.7	1,436.8	2,570.2	2,781.4
Southern Europe | Staffing and Interim | Italy
Disaggregation of Revenue [Line Items]
Revenue	365.2	413.9	695.2	800.9
Southern Europe | Staffing and Interim | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	471.9	383.8	818.9	762.5
Southern Europe | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	151.6	144.6	298.5	292.9
Southern Europe | Outcome-Based Solutions and Consulting | France
Disaggregation of Revenue [Line Items]
Revenue	56.7	55.2	114.0	114.3
Southern Europe | Outcome-Based Solutions and Consulting | Italy
Disaggregation of Revenue [Line Items]
Revenue	11.7	12.8	21.2	24.3
Southern Europe | Outcome-Based Solutions and Consulting | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	83.2	76.6	163.3	154.3
Southern Europe | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	40.3	38.8	78.9	77.4
Southern Europe | Permanent Recruitment | France
Disaggregation of Revenue [Line Items]
Revenue	13.6	14.5	28.1	29.4
Southern Europe | Permanent Recruitment | Italy
Disaggregation of Revenue [Line Items]
Revenue	10.7	10.2	20.6	19.4
Southern Europe | Permanent Recruitment | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	16.0	14.1	30.2	28.6
Southern Europe | Other
Disaggregation of Revenue [Line Items]
Revenue	12.5	16.1	27.7	30.9
Southern Europe | Other | France
Disaggregation of Revenue [Line Items]
Revenue	4.2	6.0	9.3	11.4
Southern Europe | Other | Italy
Disaggregation of Revenue [Line Items]
Revenue	6.4	6.1	12.9	12.0
Southern Europe | Other | Other Southern Europe
Disaggregation of Revenue [Line Items]
Revenue	1.9	4.0	5.5	7.5
Northern Europe
Disaggregation of Revenue [Line Items]
Revenue	1,183.2	1,393.2	2,372.9	2,810.8
Northern Europe | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	1,149.9	1,354.8	2,306.5	2,734.0
Northern Europe | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	33.3	38.4	66.4	76.8
Northern Europe | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	1,050.8	1,234.0	2,104.2	2,489.2
Northern Europe | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	86.5	106.1	176.2	215.9
Northern Europe | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	38.2	45.0	76.3	89.5
Northern Europe | Other
Disaggregation of Revenue [Line Items]
Revenue	7.7	8.1	16.2	16.2
APME
Disaggregation of Revenue [Line Items]
Revenue	708.9	724.8	1,408.8	1,445.0
APME | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	675.7	689.5	1,347.1	1,378.4
APME | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	33.2	35.3	61.7	66.6
APME | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	582.0	599.5	1,165.4	1,198.7
APME | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	73.5	69.0	142.9	137.4
APME | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	50.1	52.0	93.8	101.0
APME | Other
Disaggregation of Revenue [Line Items]
Revenue	3.3	4.3	6.7	7.9
Right Management
Disaggregation of Revenue [Line Items]
Revenue	50.4	52.4	96.2	102.4
Right Management | Services transferred over time
Disaggregation of Revenue [Line Items]
Revenue	50.4	52.4	96.2	102.4
Right Management | Services transferred at a point in time
Disaggregation of Revenue [Line Items]
Revenue	0.0	0.0	0.0	0.0
Right Management | Staffing and Interim
Disaggregation of Revenue [Line Items]
Revenue	0.0	0.0	0.0	0.0
Right Management | Outcome-Based Solutions and Consulting
Disaggregation of Revenue [Line Items]
Revenue	12.3	12.5	22.4	24.0
Right Management | Permanent Recruitment
Disaggregation of Revenue [Line Items]
Revenue	0.0	0.0	0.0	0.0
Right Management | Other
Disaggregation of Revenue [Line Items]
Revenue	$ 38.1	$ 39.9	$ 73.8	$ 78.4

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