12. Accumulated Other Comprehensive Income (Details) (USD $) In Millions, unless otherwise specified	9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011
Accumulated Other Comprehensive Income (Loss), beginning balance	$ 2.6	$ (12.9)
Change in component during the year	1.6	13.4
Accumulated Other Comprehensive Income (Loss), ending balance	4.2	0.5
Net Unrealized Investment Losses [Member]
Accumulated Other Comprehensive Income (Loss), beginning balance	25.9	6.5
Change in component during the year	(1.1)	15.9
Accumulated Other Comprehensive Income (Loss), ending balance	24.8	22.4
Portion of OTTI Losses Recognized in OCI [Member]
Accumulated Other Comprehensive Income (Loss), beginning balance	(23.3)	(19.4)
Change in component during the year	2.7	(2.5)
Accumulated Other Comprehensive Income (Loss), ending balance	$ (20.6)	$ (21.9)