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Segment Data - Schedule of Segment Data (Details) - USD ($)	3 Months Ended									12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Sep. 30, 2017	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Segment Reporting Information [Line Items]
Revenues from Services	$ 5,196,600,000	$ 5,248,900,000	$ 5,373,100,000	$ 5,044,900,000	$ 5,393,200,000	$ 5,418,700,000	$ 5,656,900,000	$ 5,522,400,000		$ 20,863,500,000	$ 21,991,200,000	$ 21,034,300,000
Operating Unit Profit										860,600,000	941,800,000	932,200,000
Corporate expenses										(121,900,000)	(110,000,000.0)	(108,400,000)
Impairment charge		$ 0				$ 0			$ 0	(64,000,000.0)
Intangible asset amortization expense										(29,800,000)	(35,100,000)	(34,600,000)
Interest and other income (expenses), net										40,600,000	(42,000,000.0)	(51,900,000)
Earnings before income taxes										685,500,000	754,700,000	737,300,000
Depreciation and Amortization Expense										77,200,000	85,800,000	84,400,000
Earnings from Equity Investments										50,500,000	1,200,000	15,000,000.0
Total Assets	9,223,800,000				8,519,800,000					9,223,800,000	8,519,800,000	8,883,600,000
Equity Investments	97,800,000				161,400,000					97,800,000	161,400,000	158,700,000
Long-Lived Assets	150,900,000				160,000,000.0					150,900,000	160,000,000.0	161,300,000
Additions to Long-Lived Assets										48,700,000	60,300,000	53,900,000
Corporate
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										100,000	100,000	200,000
Total Assets	489,400,000				520,900,000					489,400,000	520,900,000	499,200,000
Equity Investments	97,500,000				1,000,000.0					97,500,000	1,000,000.0	1,000,000.0
Long-Lived Assets	200,000				100,000					200,000	100,000	100,000
Additions to Long-Lived Assets										100,000	100,000	0
Segment Reconciling Items
Segment Reporting Information [Line Items]
Intangible asset amortization expense										29,800,000	35,100,000	34,600,000
Americas
Segment Reporting Information [Line Items]
Revenues from Services										4,182,300,000	4,159,300,000	4,216,400,000
Operating Unit Profit										186,300,000	203,900,000	213,300,000
Earnings from Equity Investments										0	0	0
Americas | Reportable segments
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										10,300,000	10,400,000	11,800,000
Total Assets	2,487,000,000.0				2,168,900,000					2,487,000,000.0	2,168,900,000	2,110,600,000
Equity Investments	0				0					0	0	0
Long-Lived Assets	28,000,000.0				25,600,000					28,000,000.0	25,600,000	26,700,000
Americas | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										12,600,000	10,400,000	9,100,000
Southern Europe
Segment Reporting Information [Line Items]
Revenues from Services										9,166,400,000	9,371,600,000	8,657,000,000.0
Operating Unit Profit										454,600,000	467,600,000	443,900,000
Earnings from Equity Investments										47,400,000	1,500,000	15,000,000.0
Southern Europe | Reportable segments
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										20,400,000	20,700,000	18,800,000
Total Assets	3,957,100,000				3,711,400,000					3,957,100,000	3,711,400,000	3,786,000,000.0
Equity Investments	300,000				158,100,000					300,000	158,100,000	157,600,000
Long-Lived Assets	75,000,000.0				77,600,000					75,000,000.0	77,600,000	77,100,000
Southern Europe | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										19,800,000	26,200,000	25,700,000
Northern Europe
Segment Reporting Information [Line Items]
Revenues from Services										4,691,300,000	5,370,500,000	5,306,400,000
Operating Unit Profit										67,100,000	122,700,000	140,100,000
Earnings from Equity Investments										0	0	0
Northern Europe | Reportable segments
Segment Reporting Information [Line Items]
Impairment charge										(60,200,000)
Depreciation and Amortization Expense										9,500,000	11,000,000.0	10,600,000
Total Assets	1,470,600,000				1,237,000,000.0					1,470,600,000	1,237,000,000.0	1,569,000,000.0
Equity Investments	0				0					0	0	0
Long-Lived Assets	27,100,000				29,900,000					27,100,000	29,900,000	28,000,000.0
Northern Europe | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										7,600,000	16,600,000	11,800,000
APME
Segment Reporting Information [Line Items]
Revenues from Services										2,627,200,000	2,890,300,000	2,636,400,000
Operating Unit Profit										122,600,000	114,800,000	98,900,000
Earnings from Equity Investments										3,100,000	(300,000)	0
APME | Reportable segments
Segment Reporting Information [Line Items]
Impairment charge										(3,800,000)
Depreciation and Amortization Expense										5,600,000	5,700,000	4,700,000
Total Assets	707,600,000				754,000,000.0					707,600,000	754,000,000.0	780,700,000
Equity Investments	0				2,300,000					0	2,300,000	100,000
Long-Lived Assets	18,400,000				21,500,000					18,400,000	21,500,000	21,400,000
APME | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										8,000,000.0	6,800,000	6,300,000
Right Management
Segment Reporting Information [Line Items]
Revenues from Services										196,300,000	199,500,000	218,100,000
Operating Unit Profit										30,000,000.0	32,800,000	36,000,000.0
Earnings from Equity Investments										0	0	0
Right Management | Reportable segments
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										1,500,000	2,800,000	3,700,000
Total Assets	112,100,000				127,600,000					112,100,000	127,600,000	138,100,000
Equity Investments	0				0					0	0	0
Long-Lived Assets	2,200,000				5,300,000					2,200,000	5,300,000	8,000,000.0
Right Management | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										600,000	200,000	1,000,000.0
United States | Americas
Segment Reporting Information [Line Items]
Revenues from Services										2,507,000,000.0	2,522,300,000	2,659,000,000.0
Earnings from Equity Investments										0	0	0
United States | Americas | Reportable segments
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										8,000,000.0	8,200,000	9,300,000
Total Assets	2,107,800,000				1,827,400,000					2,107,800,000	1,827,400,000	1,781,400,000
Equity Investments	0				0					0	0	0
Long-Lived Assets	20,000,000.0				19,600,000					20,000,000.0	19,600,000	20,600,000
United States | Americas | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										8,100,000	7,600,000	6,700,000
Other Americas | Americas
Segment Reporting Information [Line Items]
Revenues from Services										1,675,300,000	1,637,000,000.0
Earnings from Equity Investments										0	0	0
Other Americas | Americas | Reportable segments
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										2,300,000	2,200,000	2,500,000
Total Assets	379,200,000				341,500,000					379,200,000	341,500,000	329,200,000
Equity Investments	0				0					0	0	0
Long-Lived Assets	8,000,000.0				6,000,000.0					8,000,000.0	6,000,000.0	6,100,000
Other Americas | Americas | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										4,500,000	2,800,000	2,400,000
France | Southern Europe
Segment Reporting Information [Line Items]
Revenues from Services										5,459,700,000	5,827,700,000
Earnings from Equity Investments										0	0	0
France | Southern Europe | Reportable segments
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										13,700,000	14,000,000.0	12,300,000
Total Assets	2,722,700,000				2,729,700,000					2,722,700,000	2,729,700,000	2,753,100,000
Equity Investments	0				0					0	0	0
Long-Lived Assets	46,300,000				49,200,000					46,300,000	49,200,000	47,900,000
France | Southern Europe | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										12,800,000	18,100,000	15,200,000
Italy | Southern Europe
Segment Reporting Information [Line Items]
Revenues from Services										1,506,500,000	1,670,600,000
Earnings from Equity Investments										(100,000)	(200,000)	0
Italy | Southern Europe | Reportable segments
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										1,800,000	1,900,000	1,800,000
Total Assets	463,400,000				405,000,000.0					463,400,000	405,000,000.0	436,700,000
Equity Investments	300,000				300,000					300,000	300,000	400,000
Long-Lived Assets	5,200,000				5,000,000.0					5,200,000	5,000,000.0	4,900,000
Italy | Southern Europe | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										2,100,000	2,200,000	1,700,000
Other Southern Europe | Southern Europe
Segment Reporting Information [Line Items]
Revenues from Services										2,200,200,000	1,873,300,000
Earnings from Equity Investments										47,500,000	1,700,000	15,000,000.0
Other Southern Europe | Southern Europe | Reportable segments
Segment Reporting Information [Line Items]
Depreciation and Amortization Expense										4,900,000	4,800,000	4,700,000
Total Assets	771,000,000.0				576,700,000					771,000,000.0	576,700,000	596,200,000
Equity Investments	0				157,800,000					0	157,800,000	157,200,000
Long-Lived Assets	$ 23,500,000				$ 23,400,000					23,500,000	23,400,000	24,300,000
Other Southern Europe | Southern Europe | Segment Reconciling Items
Segment Reporting Information [Line Items]
Additions to Long-Lived Assets										4,900,000	5,900,000	8,800,000
Reportable subsegments | United States | Americas
Segment Reporting Information [Line Items]
Operating Unit Profit										113,200,000	130,800,000	152,100,000
Reportable subsegments | Other Americas | Americas
Segment Reporting Information [Line Items]
Revenues from Services										1,675,300,000	1,637,000,000.0	1,557,400,000
Operating Unit Profit										73,100,000	73,100,000	61,200,000
Reportable subsegments | France | Southern Europe
Segment Reporting Information [Line Items]
Revenues from Services										5,459,700,000	5,827,700,000	5,477,200,000
Operating Unit Profit										284,300,000	290,400,000	280,000,000.0
Reportable subsegments | Italy | Southern Europe
Segment Reporting Information [Line Items]
Revenues from Services										1,506,500,000	1,670,600,000	1,475,900,000
Operating Unit Profit										102,600,000	111,100,000	104,500,000
Reportable subsegments | Other Southern Europe | Southern Europe
Segment Reporting Information [Line Items]
Revenues from Services										2,200,200,000	1,873,300,000	1,703,900,000
Operating Unit Profit										$ 67,700,000	$ 66,100,000	$ 59,400,000

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