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Equity Investments in Affiliates (Details) (USD $)
In Millions, unless otherwise specified
12 Months Ended
Dec. 31, 2012
Dec. 31, 2011
Dec. 31, 2010
Schedule of Equity Method Investments      
Amortization expense during the period $ 200.0 $ 97.7 $ 60.0
Annual amortization expense attributable to current equity method Affiliates for next five years      
2013 41.5    
2014 20.0    
2015 11.7    
2016 8.9    
2017 8.9    
Summarized financial information for Affiliates accounted for under the equity method      
Revenue 1,005.4 581.0 619.5
Net income 783.3 387.9 444.2
Current assets 11,957.8 8,193.1  
Noncurrent assets 34.7 29.1  
Current liabilities 1,361.5 1,022.7  
Noncurrent liabilities and Non-controlling interest 9,857.6 6,754.3  
Undistributed earnings from equity method investments 87.0    
Blue Mountain Capital Management
     
Schedule of Equity Method Investments      
Purchase price allocated to acquired client relationship 131.7    
Period of consideration paid 15 years    
Acquired client relationships under equity method investments
     
Schedule of Equity Method Investments      
Weighted average life 9 years    
Amortization expense during the period $ 36.9 $ 32.9