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Intangible Assets (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Jun. 30, 2013
Jun. 30, 2012
Intangible assets        
Amortization and impairment expenses of intangible assets $ 32.6 $ 114.7 $ 65.5 $ 145.1
Additional investments in new or existing Affiliates 0   0  
Acquired client relationships
        
Intangible assets        
Weighted average life     11 years  
Amortization and impairment expenses of intangible assets 32.6 114.7 65.5 145.1
Annual amortization expense for each of the next five years     100.0  
Additional investments in new or existing Affiliates $ 0   $ 0