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Goodwill and Other Intangible Assets, Goodwill by Reporting Unit (Details) (USD $)
In Millions, unless otherwise specified
Jun. 30, 2012
Dec. 31, 2011
Goodwill [Line Items]    
Goodwill $ 1,014.0 [1] $ 984.7 [1]
United States [Member]
    
Goodwill [Line Items]    
Goodwill 504.0 503.8
Netherlands (Vitae) [Member]
    
Goodwill [Line Items]    
Goodwill 77.5 79.3
France [Member]
    
Goodwill [Line Items]    
Goodwill 69.5 42.1
Right Management [Member]
    
Goodwill [Line Items]    
Goodwill 60.6 60.3
Other reporting units [Member]
    
Goodwill [Line Items]    
Goodwill 302.4 [2] 299.2 [2]
Elan [Member]
    
Goodwill [Line Items]    
Goodwill   $ 123.8
[1] Balances were net of accumulated impairment loss of $513.4 as of both January 1, 2012 and June 30, 2012.
[2] Elan reporting unit, which carried $123.8 of goodwill as of December 31, 2011, was integrated into other reporting units within our Northern Europe reportable segment as of January 1, 2012.