Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2013		Sep. 30, 2012
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), beginning balance	$ 11.4	[1]	$ 2.6	[1],[2]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(1.4)	[1]	1.6	[1],[2]
Amounts reclassified from AOCI	(4.4)	[1],[2]
Accumulated Other Comprehensive Income (Loss), ending balance	5.6	[1]	4.2	[1]
Net Unrealized Investment Losses [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), beginning balance	(1.3)	[1]	(7.4)	[1],[2]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	3.6	[1]	5.4	[1],[2]
Amounts reclassified from AOCI	(0.4)	[1],[2]
Accumulated Other Comprehensive Income (Loss), ending balance	1.9	[1]	(2.0)	[1]
Portion of OTTI Losses Recognized in OCI [Member]
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward]
Accumulated Other Comprehensive Income (Loss), beginning balance	12.7	[1]	10.0	[1],[2]
Other Comprehensive Income (Loss), before Reclassifications, Net of Tax	(5.0)	[1]	(3.8)	[1],[2]
Amounts reclassified from AOCI	(4.0)	[1],[2]
Accumulated Other Comprehensive Income (Loss), ending balance	$ 3.7	[1]	$ 6.2	[1]

[1] See Note 6 to these financial statements for additional information regarding offsets to net unrealized investment gains and losses which include policyholder dividend obligation, DAC and other actuarial offsets, and deferred income tax expense (benefit).

[2] Except for the change in component during 2013 and the balance as of September 30, 2013 and December 31, 2012.