(Millions) | 2013 | 2012 | 2011 | ||||||||
Debt securities | $ | 768.5 | $ | 763.7 | $ | 829.2 | |||||
Mortgage loans | 99.4 | 122.4 | 102.8 | ||||||||
Other investments | 86.1 | 70.7 | 32.2 | ||||||||
Gross investment income | 954.0 | 956.8 | 964.2 | ||||||||
Less: investment expenses | (37.7 | ) | (34.6 | ) | (31.0 | ) | |||||
Net investment income (1) | $ | 916.3 | $ | 922.2 | $ | 933.2 | |||||
(1) | Net investment income includes $293.5 million, $324.2 million and $318.7 million for 2013, 2012 and 2011, respectively, related to investments supporting our experience-rated and discontinued products. |