Restatement and Amendment of Previously Reported Financial Information Summary of Correction of Investment Errors, Income Statement (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
REVENUES:
Premiums	$ 3.1	$ 0.7
Insurance and investment product fees	90.1	96.8
Net investment income	33.0	30.6
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) losses	(0.3)	(0.7)
Portion of OTTI gains (losses) recognized in other comprehensive income (“OCI”)	(0.7)	(0.3)
Net OTTI losses recognized in earnings	(1.0)	(1.0)
Net realized investment gains (losses), excluding OTTI losses	(16.4)	(1.5)
Net realized investment gains (losses)	(17.4)	(2.5)
Total revenues	108.8	125.6
BENEFITS AND EXPENSES:
Policy benefits	88.5	61.8
Policy acquisition cost amortization	14.0	40.7
Other operating expenses	28.6	26.8
Total benefits and expenses	131.1	129.3
Income (loss) before income taxes	(22.3)	(3.7)
Income tax expense (benefit)	(1.9)	18.8
Net income (loss)	(20.4)	(22.5)
COMPREHENSIVE INCOME (LOSS):
Unrealized investment gains (losses), net of related offsets	(13.3)	8.6
Less: Income tax expense (benefit) related to:
Unrealized investment gains (losses), net of related offsets	2.7	3.7
Other comprehensive income (loss), net of income taxes	(16.0)	4.9
Comprehensive income (loss)	(36.4)	(17.6)
Derivative Valuation
REVENUES:
Premiums		0
Insurance and investment product fees		0
Net investment income		0
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) losses		0
Portion of OTTI gains (losses) recognized in other comprehensive income (“OCI”)		0
Net OTTI losses recognized in earnings		0
Net realized investment gains (losses), excluding OTTI losses		4.1
Net realized investment gains (losses)		4.1
Total revenues		4.1
BENEFITS AND EXPENSES:
Policy benefits		0
Policy acquisition cost amortization		(1.4)
Other operating expenses		0
Total benefits and expenses		(1.4)
Income (loss) before income taxes		5.5
Income tax expense (benefit)		0
Net income (loss)		5.5
COMPREHENSIVE INCOME (LOSS):
Unrealized investment gains (losses), net of related offsets		0
Less: Income tax expense (benefit) related to:
Unrealized investment gains (losses), net of related offsets		0
Other comprehensive income (loss), net of income taxes		0
Comprehensive income (loss)		5.5
Structured Securities
REVENUES:
Premiums		0
Insurance and investment product fees		0
Net investment income		0.1
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) losses		0.4
Portion of OTTI gains (losses) recognized in other comprehensive income (“OCI”)		(0.7)
Net OTTI losses recognized in earnings		(0.3)
Net realized investment gains (losses), excluding OTTI losses		0
Net realized investment gains (losses)		(0.3)
Total revenues		(0.2)
BENEFITS AND EXPENSES:
Policy benefits		0
Policy acquisition cost amortization		0
Other operating expenses		0
Total benefits and expenses		0
Income (loss) before income taxes		(0.2)
Income tax expense (benefit)		0
Net income (loss)		(0.2)
COMPREHENSIVE INCOME (LOSS):
Unrealized investment gains (losses), net of related offsets		0.3
Less: Income tax expense (benefit) related to:
Unrealized investment gains (losses), net of related offsets		0
Other comprehensive income (loss), net of income taxes		0.3
Comprehensive income (loss)		0.1
Total Investment Errors
REVENUES:
Premiums		0
Insurance and investment product fees		0
Net investment income		0.1
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) losses		0.4
Portion of OTTI gains (losses) recognized in other comprehensive income (“OCI”)		(0.7)
Net OTTI losses recognized in earnings		(0.3)
Net realized investment gains (losses), excluding OTTI losses		4.1
Net realized investment gains (losses)		3.8
Total revenues		3.9
BENEFITS AND EXPENSES:
Policy benefits		0
Policy acquisition cost amortization		(1.4)
Other operating expenses		0
Total benefits and expenses		(1.4)
Income (loss) before income taxes		5.3
Income tax expense (benefit)		0
Net income (loss)		5.3
COMPREHENSIVE INCOME (LOSS):
Unrealized investment gains (losses), net of related offsets		0.3
Less: Income tax expense (benefit) related to:
Unrealized investment gains (losses), net of related offsets		0
Other comprehensive income (loss), net of income taxes		0.3
Comprehensive income (loss)		5.6
Available-for-sale Securities | AFS Valuation
REVENUES:
Premiums		0
Insurance and investment product fees		0
Net investment income		0
Net realized investment gains (losses):
Total other-than-temporary impairment (“OTTI”) losses		0
Portion of OTTI gains (losses) recognized in other comprehensive income (“OCI”)		0
Net OTTI losses recognized in earnings		0
Net realized investment gains (losses), excluding OTTI losses		0
Net realized investment gains (losses)		0
Total revenues		0
BENEFITS AND EXPENSES:
Policy benefits		0
Policy acquisition cost amortization		0
Other operating expenses		0
Total benefits and expenses		0
Income (loss) before income taxes		0
Income tax expense (benefit)		0
Net income (loss)		0
COMPREHENSIVE INCOME (LOSS):
Unrealized investment gains (losses), net of related offsets		0
Less: Income tax expense (benefit) related to:
Unrealized investment gains (losses), net of related offsets		0
Other comprehensive income (loss), net of income taxes		0
Comprehensive income (loss)		$ 0