Goodwill and Other Intangible Assets, Changes in Goodwill (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015		Dec. 31, 2014
Goodwill [Roll Forward]
Goodwill, beginning of period	$ 1,075.2	[1]
Goodwill acquired	18.3
Currency and other impacts	(36.7)
Goodwill, end of period	1,056.8	[1]
France [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period			76.9
Goodwill, end of period	68.2		76.9
Italy [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period			5.0
Goodwill, end of period	4.4		5.0
Americas [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	466.3	[2]
Goodwill acquired	0	[2]
Currency and other impacts	(1.3)	[2]
Goodwill, end of period	465.0	[2]
Americas [Member] | United States [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period			450.4
Goodwill, end of period	450.4		450.4
Southern Europe [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	100.5	[3]
Goodwill acquired	0	[3]
Currency and other impacts	(10.8)	[3]
Goodwill, end of period	89.7	[3]
Northern Europe [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	311.3
Goodwill acquired	18.3
Currency and other impacts	(23.6)
Goodwill, end of period	306.0
APME [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	70.1
Goodwill acquired	0
Currency and other impacts	(1.0)
Goodwill, end of period	69.1
Right Management [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	62.1
Goodwill acquired	0
Currency and other impacts	0
Goodwill, end of period	62.1
Corporate [Member]
Goodwill [Roll Forward]
Goodwill, beginning of period	64.9	[4]
Goodwill acquired	0	[4]
Currency and other impacts	0	[4]
Goodwill, end of period	64.9	[4]
Jefferson Wells [Member]
Goodwill [Roll Forward]
Goodwill, end of period	$ 55.5

[1] Balances were net of accumulated impairment loss of $513.4 as of both March 31, 2015 and December 31, 2014.

[2] Balances related to the United States were $450.4 as of both January 1, 2015 and March 31, 2015.

[3] Balances related to France were $76.9 and $68.2 as of January 1, 2015 and March 31, 2015, respectively. Balances related to Italy were $5.0 and $4.4 as of January 1, 2015 and March 31, 2015, respectively.

[4] The majority of the Corporate balance relates to goodwill attributable to our acquisition of Jefferson Wells ($55.5) which is now part of the United States reporting unit. For purposes of monitoring our total assets by segment, we do not allocate the Corporate balance to the respective reportable segments as this is commensurate with how we operate our business. We do, however, include these balances within the appropriate reporting units for our goodwill impairment testing. See table below for the breakout of goodwill balances by reporting unit.