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Goodwill and Other Intangible Assets, Goodwill by Reporting Unit (Details) (USD $)
In Millions, unless otherwise specified
Mar. 31, 2013
Dec. 31, 2012
Goodwill [Line Items]    
Goodwill $ 1,031.0 [1] $ 1,041.3 [1]
Intangible Assets, Future Amortization Expense by Fiscal Year [Abstract]    
Estimated amortization expense, remainder of the current fiscal year 24.7  
Estimated amortization expense, 2014 28.0  
Estimated amortization expense, 2015 24.8  
Estimated amortization expense, 2016 20.7  
Estimated amortization expense, 2017 18.8  
Estimated amortization expense, 2018 16.9  
United States [Member]
    
Goodwill [Line Items]    
Goodwill 504.0 504.0
Netherlands (Vitae) [Member]
    
Goodwill [Line Items]    
Goodwill 78.4 80.7
France [Member]
    
Goodwill [Line Items]    
Goodwill 81.4 83.8
Right Management [Member]
    
Goodwill [Line Items]    
Goodwill 62.1 62.1
Other reporting units [Member]
    
Goodwill [Line Items]    
Goodwill $ 305.1 $ 310.7
[1] Balances were net of accumulated impairment loss of $513.4 as of both March 31, 2013 and December 31, 2012.