Discontinued Operations (Details 2) (USD $) In Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2011	Jun. 30, 2010	Jun. 30, 2011	Jun. 30, 2010
Revenues
Earned insurance premiums	$ 495.8	$ 649.4	$ 982.0	$ 1,315.2
Net investment income	45.8	52.7	95.3	108.5
Net realized and unrealized investment gains	57.3	11.1	76.6	93.1
Other revenue	(27.8)	(23.6)	(34.8)	(13.5)
Total revenues	571.1	689.6	1,119.1	1,503.3
Expenses
Loss and loss adjustment expenses	292.4	402.1	665.0	954.0
Insurance and reinsurance acquisition expenses	100.4	134.6	193.1	273.6
Other underwriting expenses	74.8	81.9	151.0	177.5
General and administrative expenses	56.2	52.3	84.2	87.4
Total expenses	536.7	685.6	1,119.3	1,523.5
Income tax (expense) benefit	9.5	(2.1)	1.6	(2.3)
Net income (loss) from discontinued operations, net of tax	(0.3)	1.8	2.9	(0.8)
Discontinued Operations.
Revenues
Earned insurance premiums	219.7	209.7	429.0	408.6
Net investment income	4.0	4.8	8.0	9.6
Net realized and unrealized investment gains	4.4	1.6	7.8	6.6
Other revenue	17.2	15.0	34.9	29.4
Total revenues	245.3	231.1	479.7	454.2
Expenses
Loss and loss adjustment expenses	156.2	152.5	310.1	303.8
Insurance and reinsurance acquisition expenses	51.7	44.5	99.2	86.6
Other underwriting expenses	19.1	18.6	37.5	38.9
General and administrative expenses	23.3	12.4	35.8	24.4
Total expenses	250.3	228.0	482.6	453.7
Pre-tax income (loss)	(5.0)	3.1	(2.9)	0.5
Income tax (expense) benefit	4.7	(1.3)	5.8	(1.3)
Net income (loss) from discontinued operations, net of tax	$ (0.3)	$ 1.8	$ 2.9	$ (0.8)