v3.3.1.900
Equity (Share Repurchases) (Details) - USD ($)
$ / shares in Units, $ in Millions
 12 Months Ended
Dec. 31, 2014
Dec. 31, 2013
Dec. 31, 2012
Jan. 29, 2015
Class of Stock [Line Items]        
Stock repurchase, remaining authorized amount (in shares) $ 1,933.7      
Distributable reserves recognized   $ 28,700.0    
Common Class A and Common Class C Member [Member]        
Class of Stock [Line Items]        
Stock repurchase, authorized amount $ 4,500.0      
Common Class A Stock Purchased Under Repurchase Programs [Member]        
Class of Stock [Line Items]        
Shares purchased pursuant to repurchase programs (in shares) 8,062,792 6,550,197 5,611,380  
Average price paid per share pursuant to repurchase programs (in dollars per shares) $ 42.19 $ 37.70 $ 27.30  
Common Class C Stock Purchased Under Repurchase Programs [Member]        
Class of Stock [Line Items]        
Shares purchased pursuant to repurchase programs (in shares) 28,401,019 24,761,397 32,782,838  
Average price paid per share pursuant to repurchase programs (in dollars per shares) $ 44.25 $ 36.55 $ 25.24  
Total Common Class C and Class A Stock Purchased Under Repurchase Programs [Member]        
Class of Stock [Line Items]        
Total cost for stock purchased pursuant to repurchase programs $ 1,596.9 $ 1,151.9 $ 980.7  
Subsequent Event [Member] | Common Class A and Common Class C Member [Member]        
Class of Stock [Line Items]        
Stock repurchase, authorized amount       $ 2,000.0