Proceeds from fixed maturity securities, equity securities and other invested assets and the related gross realized gains and gross realized losses for the years ended December 31 are as follows:
|  | 
|  |  |  |  |  |  |  |  |  |  |  |  | 
|   | 2013 |   | 2012 |   | 2011 | 
| Proceeds | $ | 13,662.8 | 
 |   | $ | 15,915.6 | 
 |   | $ | 12,654.3 | 
 | 
| Gross realized gains | 498.1 | 
 |   | 483.5 | 
 |   | 368.2 | 
 | 
| Gross realized losses | (226.2 | ) |   | (148.6 | ) |   | (133.1 | ) |