Restatement and Amendment of Previously Reported Financial Information Summary of Correction of Errors, Cash Flow (Details) (USD $)	6 Months Ended	12 Months Ended
	Jun. 30, 2012	Dec. 31, 2012
OPERATING ACTIVITIES:
Net income (loss)	$ (54,600,000)
Net realized investment (gains) losses	16,500,000
Policy acquisition costs deferred	(43,500,000)
Policy acquisition cost amortization	68,300,000
Interest credited	122,300,000
Equity in earnings of limited partnerships and other investments	(100,000)
Change in:
Accrued investment income	(5,500,000)
Deferred income taxes, net	(5,700,000)
Receivables	32,600,000
Policy liabilities and accruals	(171,300,000)
Due to/from affiliate	10,900,000
Other operating activities, net	(14,200,000)
Cash provided by (used for) operating activities	(76,600,000)
Purchases of:
Available-for-sale debt securities	(524,000,000)
Derivative instruments	(29,200,000)
Fair value investments	(2,900,000)
Sales, repayments and maturities of:
Proceeds from sales		160,000,000
Derivative instruments	12,100,000
Fair value investments	3,000,000
Contributions to limited partnerships	(900,000)
Distributions from limited partnerships	200,000
Policy loans, net	2,400,000
Other investing activities, net	(400,000)
Cash provided by (used for) investing activities	(312,900,000)
FINANCING ACTIVITIES:
Policyholder deposit fund deposits	540,500,000
Policyholder deposit fund withdrawals	(265,400,000)
Net transfers to/from separate accounts	142,000,000
Cash provided by (used for) financing activities	417,100,000
Change in cash and cash equivalents	27,600,000
Cash and cash equivalents, beginning of year	49,500,000	49,500,000
Cash and cash equivalents, end of year	77,100,000	83,100,000
Supplemental Disclosure of Cash Flow Information
Income taxes paid (refunded)	22,200,000.0
Non-Cash Transactions During the Year
Investment exchanges	14,000,000
Corrections of Errors
OPERATING ACTIVITIES:
Net income (loss)	(51,500,000)
Net realized investment (gains) losses	1,700,000
Policy acquisition costs deferred	9,400,000
Policy acquisition cost amortization	12,600,000
Interest credited	122,300,000
Equity in earnings of limited partnerships and other investments	0
Change in:
Accrued investment income	(1,600,000)
Deferred income taxes, net	11,900,000
Receivables	4,600,000
Policy liabilities and accruals	(203,300,000)
Due to/from affiliate	10,900,000
Other operating activities, net	(10,700,000)
Cash provided by (used for) operating activities	(93,700,000)
Purchases of:
Available-for-sale debt securities	17,900,000
Derivative instruments	0
Fair value investments	(2,900,000)
Other investments	900,000
Sales, repayments and maturities of:
Proceeds from sales	(17,200,000)
Derivative instruments	0
Fair value investments	3,000,000
Other investments	(200,000)
Contributions to limited partnerships	(900,000)
Distributions from limited partnerships	200,000
Policy loans, net	1,000,000
Other investing activities, net	(400,000)
Cash provided by (used for) investing activities	1,400,000
FINANCING ACTIVITIES:
Policyholder deposit fund deposits	130,300,000
Policyholder deposit fund withdrawals	(182,600,000)
Net transfers to/from separate accounts	142,000,000
Cash provided by (used for) financing activities	89,700,000
Change in cash and cash equivalents	(2,600,000)
Cash and cash equivalents, beginning of year	(18,000,000)	(18,000,000)
Cash and cash equivalents, end of year	(20,600,000)
Supplemental Disclosure of Cash Flow Information
Income taxes paid (refunded)	22,200,000
Non-Cash Transactions During the Year
Investment exchanges	14,000,000
As previously reported
OPERATING ACTIVITIES:
Net income (loss)	(3,100,000)
Net realized investment (gains) losses	14,800,000
Policy acquisition costs deferred	(52,900,000)
Policy acquisition cost amortization	55,700,000
Interest credited	0
Equity in earnings of limited partnerships and other investments	(100,000)
Change in:
Accrued investment income	(3,900,000)
Deferred income taxes, net	(17,600,000)
Receivables	(4,300,000)
Policy liabilities and accruals	32,000,000
Due to/from affiliate	0
Other operating activities, net	(3,500,000)
Cash provided by (used for) operating activities	17,100,000
Purchases of:
Available-for-sale debt securities	(601,900,000)
Derivative instruments	(29,200,000)
Fair value investments	0
Other investments	(900,000)
Sales, repayments and maturities of:
Proceeds from sales	304,000,000
Derivative instruments	12,100,000
Fair value investments	0
Other investments	200,000
Contributions to limited partnerships	0
Distributions from limited partnerships	0
Policy loans, net	1,400,000
Other investing activities, net	0
Cash provided by (used for) investing activities	(314,300,000)
FINANCING ACTIVITIES:
Policyholder deposit fund deposits	410,200,000
Policyholder deposit fund withdrawals	(82,800,000)
Net transfers to/from separate accounts	0
Cash provided by (used for) financing activities	327,400,000
Change in cash and cash equivalents	30,200,000
Cash and cash equivalents, beginning of year	67,500,000	67,500,000
Cash and cash equivalents, end of year	97,700,000
Supplemental Disclosure of Cash Flow Information
Income taxes paid (refunded)	0
Non-Cash Transactions During the Year
Investment exchanges	0
As restated and amended
OPERATING ACTIVITIES:
Net income (loss)	(54,600,000)
Net realized investment (gains) losses	16,500,000
Policy acquisition costs deferred	(43,500,000)
Policy acquisition cost amortization	68,300,000
Interest credited	122,300,000
Equity in earnings of limited partnerships and other investments	(100,000)
Change in:
Accrued investment income	(5,500,000)
Deferred income taxes, net	(5,700,000)
Receivables	300,000
Policy liabilities and accruals	(171,300,000)
Due to/from affiliate	10,900,000
Other operating activities, net	(14,200,000)
Cash provided by (used for) operating activities	(76,600,000)
Purchases of:
Available-for-sale debt securities	(584,000,000)
Derivative instruments	(29,200,000)
Fair value investments	(2,900,000)
Other investments	0
Sales, repayments and maturities of:
Proceeds from sales	286,800,000
Derivative instruments	12,100,000
Fair value investments	3,000,000
Other investments	0
Contributions to limited partnerships	(900,000)
Distributions from limited partnerships	200,000
Policy loans, net	2,400,000
Other investing activities, net	(400,000)
Cash provided by (used for) investing activities	(312,900,000)
FINANCING ACTIVITIES:
Policyholder deposit fund deposits	540,500,000
Policyholder deposit fund withdrawals	(265,400,000)
Net transfers to/from separate accounts	142,000,000
Cash provided by (used for) financing activities	417,100,000
Change in cash and cash equivalents	27,600,000
Cash and cash equivalents, beginning of year	49,500,000	49,500,000
Cash and cash equivalents, end of year	77,100,000
Supplemental Disclosure of Cash Flow Information
Income taxes paid (refunded)	22,200,000
Non-Cash Transactions During the Year
Investment exchanges	$ 14,000,000