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Equity Investments in Affiliates - Narrative (Details) (USD $)
In Millions, unless otherwise specified
 12 Months Ended
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Schedule of Equity Method Investments      
Amortization expense during the period $ 128.2 $ 200.0 $ 97.7
Undistributed earnings from equity method investments 197.6    
Acquired client relationships under equity method investments
      
Schedule of Equity Method Investments      
Weighted average life 11 years    
Amortization expense during the period $ 41.7 $ 36.9