Condensed Consolidated Balance Sheets (USD $) In Millions, unless otherwise specified	Mar. 31, 2015	Dec. 31, 2014
Investments:
Fixed maturities, available-for-sale, at fair value (amortized cost of $19,378.2 as of 2015 and $19,085.0 as of 2014)	$ 21,214.9	$ 20,655.6
Fixed maturities, at fair value using the fair value option	768.2	725.7
Equity securities, available-for-sale, at fair value (cost of $107.7 as of 2015 and $107.4 as of 2014)	123.6	121.9
Short-term investments	55.4	241.5
Mortgage loans on real estate, net of valuation allowance of $1.0 as of 2015 and $1.1 as of 2014	3,665.1	3,513.0
Policy loans	234.8	239.1
Limited partnerships/corporations	256.4	248.4
Derivatives	657.3	562.0
Securities pledged (amortized cost of $217.1 as of 2015 and $224.4 as of 2014)	239.0	235.3
Total investments	27,214.7	26,542.5
Cash and cash equivalents	417.6	481.2
Short-term investments under securities loan agreement, including collateral delivered	375.7	325.4
Accrued investment income	295.6	285.2
Reinsurance recoverable	1,901.5	1,929.5
Deferred policy acquisition costs, Value of business acquired, and Sale inducements to contract owners	856.6	939.1
Notes receivable from affiliate	175.0	175.0
Short-term loan to affiliate	150.2	0
Current income tax recoverable	0	10.1
Due from affiliates	62.8	60.6
Property and equipment	73.9	74.8
Other assets	165.5	170.0
Assets held in separate accounts	64,218.8	62,808.1
Total assets	95,907.9	93,801.5
Liabilities and Shareholder's Equity
Future policy benefits and contract owner balances	25,443.5	25,129.9
Payable for securities purchased	16.2	12.1
Payables under securities loan agreement, including collateral held	680.6	617.1
Long-term debt	4.9	4.9
Due to affiliates	122.3	111.1
Derivatives	298.8	217.0
Current income tax payable to Parent	11.9	0
Deferred income taxes	448.8	367.5
Other liabilities	502.8	572.0
Liabilities related to separate accounts	64,218.8	62,808.1
Total liabilities	91,748.6	89,839.7
Shareholder's equity:
Common stock (100,000 shares authorized, 55,000 issued and outstanding as of 2015 and 2014; $50 par value per share)	2.8	2.8
Additional paid-in capital	3,584.1	3,583.9
Accumulated other comprehensive income	976.8	841.5
Retained earnings (deficit)	(404.4)	(466.4)
Total shareholder's equity	4,159.3	3,961.8
Total liabilities and shareholder's equity	$ 95,907.9	$ 93,801.5