Revision of Previously Reported Financial Statements - Statement of Income and Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2015	Mar. 31, 2014
REVENUES:
Premiums	$ 3.0	$ 2.8
Insurance and investment product fees	89.9	89.0
Net investment income	47.1	40.0
Net realized gains (losses):
Total other-than-temporary impairment (“OTTI”) losses	(0.1)	0
Portion of losses recognized in OCI	(0.1)	0
Net OTTI losses recognized in earnings	(0.2)	0
Net realized gains (losses), excluding impairment losses	(8.6)	(35.1)
Net realized gains (losses)	(8.8)	(35.1)
Total revenues	131.2	96.7
BENEFITS AND EXPENSES:
Policy benefits	99.7	72.1
Policy acquisition cost amortization	15.5	16.7
Other operating expenses	65.4	23.5
Total benefits and expenses	180.6	112.3
Income (loss) before income taxes	(49.4)	(15.6)
Income tax expense (benefit)	2.8	(0.4)
Net income (loss)	(52.2)	(15.2)
COMPREHENSIVE INCOME (LOSS):
Net income (loss)	(52.2)	(15.2)
Other comprehensive income (loss) before income taxes:
Unrealized investment gains (losses), net of related offsets	1.7	13.0
Less: Income tax expense (benefit) related to:
Unrealized investment gains (losses), net of related offsets	3.0	14.4
Other comprehensive income (loss), net of income taxes	(1.3)	(1.4)
Comprehensive income (loss)	(53.5)	(16.6)
As reported
REVENUES:
Premiums		2.8
Insurance and investment product fees		88.8
Net investment income		40.0
Net realized gains (losses):
Total other-than-temporary impairment (“OTTI”) losses		0
Portion of losses recognized in OCI		0
Net OTTI losses recognized in earnings		0
Net realized gains (losses), excluding impairment losses		(33.9)
Net realized gains (losses)		(33.9)
Total revenues		97.7
BENEFITS AND EXPENSES:
Policy benefits		76.1
Policy acquisition cost amortization		16.3
Other operating expenses		24.0
Total benefits and expenses		116.4
Income (loss) before income taxes		(18.7)
Income tax expense (benefit)		(1.9)
Net income (loss)		(16.8)
COMPREHENSIVE INCOME (LOSS):
Net income (loss)		(16.8)
Other comprehensive income (loss) before income taxes:
Unrealized investment gains (losses), net of related offsets		11.1
Less: Income tax expense (benefit) related to:
Unrealized investment gains (losses), net of related offsets		14.0
Other comprehensive income (loss), net of income taxes		(2.9)
Comprehensive income (loss)		(19.7)
Correction of errors
Net realized gains (losses):
Net realized gains (losses)		(1.2)
BENEFITS AND EXPENSES:
Policy acquisition cost amortization		0.4
Net income (loss)		1.6
COMPREHENSIVE INCOME (LOSS):
Net income (loss)		1.6
UL unlock | Correction of errors
REVENUES:
Premiums		0
Insurance and investment product fees		0
Net investment income		0
Net realized gains (losses):
Total other-than-temporary impairment (“OTTI”) losses		0
Portion of losses recognized in OCI		0
Net OTTI losses recognized in earnings		0
Net realized gains (losses), excluding impairment losses		0
Net realized gains (losses)		0
Total revenues		0
BENEFITS AND EXPENSES:
Policy benefits		(0.2)
Policy acquisition cost amortization		0.1
Other operating expenses		0
Total benefits and expenses		(0.1)
Income (loss) before income taxes		0.1
Income tax expense (benefit)		0
Net income (loss)		0.1
COMPREHENSIVE INCOME (LOSS):
Net income (loss)		0.1
Other comprehensive income (loss) before income taxes:
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)		0.4
Other adjustments | Correction of errors
REVENUES:
Premiums		0
Insurance and investment product fees		0.2
Net investment income		0
Net realized gains (losses):
Total other-than-temporary impairment (“OTTI”) losses		0
Portion of losses recognized in OCI		0
Net OTTI losses recognized in earnings		0
Net realized gains (losses), excluding impairment losses		(1.2)
Net realized gains (losses)		(1.2)
Total revenues		(1.0)
BENEFITS AND EXPENSES:
Policy benefits		(3.8)
Policy acquisition cost amortization		0.3
Other operating expenses		(0.5)
Total benefits and expenses		(4.0)
Income (loss) before income taxes		3.0
Income tax expense (benefit)		1.5
Net income (loss)		1.5
COMPREHENSIVE INCOME (LOSS):
Net income (loss)		1.5
Other comprehensive income (loss) before income taxes:
Unrealized investment gains (losses), net of related offsets		1.6
Less: Income tax expense (benefit) related to:
Unrealized investment gains (losses), net of related offsets		0.4
Other comprehensive income (loss), net of income taxes		1.2
Comprehensive income (loss)		$ 2.7