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Segment Data - Schedule of Segment Data (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Segment Reporting Information [Line Items]
Revenues from services	$ 4,924.4	$ 4,619.1
Operating unit profit	141.1	72.4
Corporate expenses	(37.2)	(27.8)
Intangible asset amortization expense	(5.5)	(6.9)
Operating profit	98.4	37.7
Interest and other expenses, net	(5.4)	(20.5)
Earnings before income taxes	93.0	17.2
Americas
Segment Reporting Information [Line Items]
Revenues from services	1,002.9	1,011.0
Operating unit profit	44.1	16.6
Southern Europe
Segment Reporting Information [Line Items]
Revenues from services	2,160.3	1,944.7
Operating unit profit	73.4	53.0
Northern Europe
Segment Reporting Information [Line Items]
Revenues from services	1,133.8	1,068.5
Operating unit profit	4.8	(14.1)
APME
Segment Reporting Information [Line Items]
Revenues from services	627.4	594.9
Operating unit profit	18.8	16.9
United States | Americas
Segment Reporting Information [Line Items]
Revenues from services	608.8	610.9
Other Americas | Americas
Segment Reporting Information [Line Items]
Revenues from services	394.1	400.1
France | Southern Europe
Segment Reporting Information [Line Items]
Revenues from services	1,188.9	1,093.8
Italy | Southern Europe
Segment Reporting Information [Line Items]
Revenues from services	402.8	327.7
Other Southern Europe | Southern Europe
Segment Reporting Information [Line Items]
Revenues from services	568.6	523.2
Reportable subsegments | United States | Americas
Segment Reporting Information [Line Items]
Revenues from services	608.8	610.9
Operating unit profit	29.2	2.3
Reportable subsegments | Other Americas | Americas
Segment Reporting Information [Line Items]
Revenues from services	394.1	400.1
Operating unit profit	14.9	14.3
Reportable subsegments | France | Southern Europe
Segment Reporting Information [Line Items]
Revenues from services	1,188.9	1,093.8
Operating unit profit	42.6	38.0
Reportable subsegments | Italy | Southern Europe
Segment Reporting Information [Line Items]
Revenues from services	402.8	327.7
Operating unit profit	19.4	14.2
Reportable subsegments | Other Southern Europe | Southern Europe
Segment Reporting Information [Line Items]
Revenues from services	568.6	523.2
Operating unit profit	$ 11.4	$ 0.8

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