7. Investing Activities (Details 5) (USD $) In Millions, unless otherwise specified	12 Months Ended
Dec. 31, 2012	Dec. 31, 2011 As restated and amended [Member]	Dec. 31, 2010 As restated and amended [Member]
Debt securities	$ 122.5	$ 94.8	$ 67.2
Policy loans	3.1	3.1	3.0
Limited partnerships and other investments	2.2	1.8	2.4
Fair value investments	4.0	2.8	3.0
Cash and cash equivalents
Total investment income	131.8	102.5	75.6
Less: Investment expenses	0.9	1.4	1.4
Net investment income	$ 130.9	$ 101.1	$ 74.2

The difference between the carrying value and the sale price of debt securities, not separately or otherwise categorized as trading, available-for-sale, or held-to-maturity. This element refers to the gain (loss) included in earnings and not to the cash proceeds of the sale.

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This item represents investment income derived from investments in debt and equity securities consisting of interest income earned from investments in debt securities and on cash and cash equivalents, dividend income from investments in equity securities, and income or expense derived from the amortization of investment related discounts or premiums, respectively, net of related investment expenses. This item does not include realized or unrealized gains or losses on the sale or holding of investments in debt and equity securities required to be included in earnings for the period or for other than temporary losses related to investments in debt and equity securities which are included in realized losses in the period recognized, and does not include investment income from real or personal property, such as rental income.

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