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Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended
Mar. 31, 2014
Mar. 31, 2013
Intangible Asset [Line Items]    
Amortization and impairment expenses of intangible assets $ 27.4 $ 32.9
Acquired client relationships [Member]
    
Intangible Asset [Line Items]    
Weighted average life 10 years  
Amortization and impairment expenses of intangible assets 27.4 32.9
Annual amortization expense for each of the next five years $ 100.0