Discontinued Operations (Details 2) (USD $) In Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2011	Sep. 30, 2010	Sep. 30, 2011	Sep. 30, 2010
Revenues
Earned insurance premiums	$ 490.6	$ 498.1	$ 1,436.7	$ 1,772.9
Net investment income	42.8	48.9	138.1	157.4
Net realized and unrealized investment gains (losses)	1.7	11.6	78.3	104.7
Other revenue	(33.8)	(7.6)	(68.6)	(21.1)
Total revenues	501.3	551.0	1,584.5	2,013.9
Expenses
Loss and loss adjustment expenses	277.1	253.4	914.0	1,175.9
Insurance and reinsurance acquisition expenses	107.0	102.1	296.2	370.9
Other underwriting expenses	67.0	75.0	211.5	245.9
General and administrative expenses	36.2	32.1	120.4	119.5
Total expenses	500.1	475.8	1,580.9	1,956.4
Income tax (expense) benefit	(0.6)	11.7	1.9	10.3
Income (loss) from discontinued operations	(11.9)	3.6	(10.7)	1.2
Loss from sale of discontinued operations, net of tax	(18.2)		(18.2)
Net income (loss) from discontinued operations, net of tax	30.1	(3.6)	28.9	(1.2)
AutoOne | Businesses classified as discontinued operations
Expenses
Loss from sale of discontinued operations, net of tax	(18.2)		(18.2)
Businesses classified as discontinued operations
Revenues
Earned insurance premiums	233.8	234.6	698.7	683.6
Net investment income	3.8	5.8	11.8	15.4
Net realized and unrealized investment gains (losses)	(6.4)	10.4	1.4	17.0
Other revenue	17.5	15.3	52.4	44.7
Total revenues	248.7	266.1	764.3	760.7
Expenses
Loss and loss adjustment expenses	180.5	172.7	518.7	508.0
Insurance and reinsurance acquisition expenses	51.4	50.8	154.5	142.2
Other underwriting expenses	32.3	21.4	76.3	66.9
General and administrative expenses	1.7	12.1	37.5	36.5
Total expenses	265.9	257.0	787.0	753.6
Pre-tax income (loss)	(17.2)	9.1	(22.7)	7.1
Income tax (expense) benefit	5.3	(5.5)	12.0	(5.9)
Income (loss) from discontinued operations	(11.9)	3.6	(10.7)	1.2
Net income (loss) from discontinued operations, net of tax	(30.1)	3.6	(28.9)	1.2
AutoOne
Expenses
Loss from sale of discontinued operations, net of tax	$ (18.2)		$ (18.2)