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(Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Leasehold improvements, useful life the shorter of the useful life or the remaining lease term    
Number of Reporting Units for Purposes of Annual Goodwill Impairment Test 13    
Foreign currency transaction pre-tax loss $ 0.6 $ 1.2 $ 0.9
Minimum
      
Buildings, useful life 10 years    
Furniture, equipment and computer software costs, useful life minimum 3 years    
Finite-Lived Intangible Asset, Useful Life 7 years    
Maximum
      
Buildings, useful life 35 years    
Furniture, equipment and computer software costs, useful life minimum 7 years    
Finite-Lived Intangible Asset, Useful Life 15 years