Income Taxes Deferred Income Tax (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Deferred income tax assets
Future policyholder benefits	$ 309.2	$ 264.3
Available-for-sale debt securities	13.1	27.8
Alternative minimum tax credits	2.1	2.1
Other	2.1	0.2
Subtotal	326.5	294.4
Valuation allowance	(127.9)	(69.9)
Total deferred income tax assets, net of valuation allowance	198.6	224.5
Deferred income tax liabilities
DAC	92.3	104.4
Investments	81.1	70.1
Other	12.1	22.2
Gross deferred income tax liabilities	185.5	196.7
Net deferred income tax assets	$ 13.1	$ 27.8