Restructuring Costs (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended								6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012	Jun. 30, 2013 France [Member]	Dec. 31, 2012 France [Member]	Jun. 30, 2013 Italy [Member]	Dec. 31, 2012 Italy [Member]	Jun. 30, 2013 United States [Member]	Dec. 31, 2012 United States [Member]	Jun. 30, 2013 Americas [Member]		Jun. 30, 2013 Southern Europe [Member]		Jun. 30, 2013 Northern Europe [Member]	Jun. 30, 2013 APME [Member]	Jun. 30, 2013 Right Management [Member]	Jun. 30, 2013 Corporate [Member]
Restructuring Costs [Abstract]
Net restructuring costs	$ 54.8	$ 21.0
Restructuring reserve [Roll Forward]
Beginning balance	41.4		3.0	3.8	0	0.9	6.2	3.8	4.5	[1]	4.7	[2]	15.6	0	6.6	10.0
Severance costs	35.9								8.4	[1]	2.9	[2]	15.4	1.5	3.5	4.2
Office closure costs	18.9								1.9	[1]	1.6	[2]	11.0	1.3	2.9	0.2
Costs paid or utilized	(46.6)								(8.0)	[1]	(6.1)	[2]	(17.1)	(1.9)	(3.7)	(9.8)
Ending balance	$ 49.6		$ 3.0	$ 3.8	$ 0	$ 0.9	$ 6.2	$ 3.8	$ 6.8	[1]	$ 3.1	[2]	$ 24.9	$ 0.9	$ 9.3	$ 4.6

[1] Balances related to the United States were $3.8 and $6.2 as of January 1, 2013 and June 30, 2013, respectively.

[2] Balances related to France were $3.8 and $3.0 as of January 1, 2013 and June 30, 2013, respectively. Balances related to Italy were $0.9 and $0.0 as of January 1, 2013 and June 30, 2013, respectively.