Restructuring Costs (Details)	6 Months Ended
	Jun. 30, 2016 USD ($)
Restructuring reserve [Roll Forward]
Balance, beginning of period	$ 16,400,000
Costs paid or utilized	(6,600,000)
Balance, end of period	9,800,000
Corporate
Restructuring reserve [Roll Forward]
Balance, beginning of period	200,000
Costs paid or utilized	(100,000)
Balance, end of period	100,000
Reportable segments | Americas
Restructuring reserve [Roll Forward]
Balance, beginning of period	3,500,000
Costs paid or utilized	(1,300,000)
Balance, end of period	2,200,000
Reportable segments | Americas | United States | Reportable subsegments
Restructuring reserve [Roll Forward]
Balance, beginning of period	2,900,000
Balance, end of period	1,600,000
Reportable segments | Southern Europe
Restructuring reserve [Roll Forward]
Balance, beginning of period	1,700,000
Costs paid or utilized	(100,000)
Balance, end of period	1,600,000
Reportable segments | Southern Europe | France | Reportable subsegments
Restructuring reserve [Roll Forward]
Balance, beginning of period	1,500,000
Balance, end of period	1,600,000
Reportable segments | Southern Europe | Italy | Reportable subsegments
Restructuring reserve [Roll Forward]
Balance, beginning of period	0
Balance, end of period	0
Reportable segments | Northern Europe
Restructuring reserve [Roll Forward]
Balance, beginning of period	8,500,000
Costs paid or utilized	(3,800,000)
Balance, end of period	4,700,000
Reportable segments | APME
Restructuring reserve [Roll Forward]
Balance, beginning of period	1,700,000
Costs paid or utilized	(1,000,000)
Balance, end of period	700,000
Reportable segments | Right Management
Restructuring reserve [Roll Forward]
Balance, beginning of period	800,000
Costs paid or utilized	(300,000)
Balance, end of period	$ 500,000