Income (Loss) from Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014	Sep. 30, 2013	Sep. 30, 2014	Sep. 30, 2013
Revenues
Earned insurance premiums	$ 538.6	$ 500.4	$ 1,535.6	$ 1,493.3
Other revenue	5.3	18.2	8.3	46.9
Total revenues	589.4	574.1	1,820.5	1,690.8
Expenses
Loss and loss adjustment expenses	289.1	278.3	801.1	797.2
Insurance and reinsurance acquisition expenses	105.3	106.7	299.3	281.0
Other underwriting expenses	81.0	80.4	244.3	244.0
Total expenses	555.0	518.8	1,565.0	1,480.1
Net (loss) income from discontinued operations	6.7	0.4	8.8	4.8
Gain (Loss) on Disposal of Discontinued Operation	14.0
Segment, Discontinued Operations
Revenues
Earned insurance premiums	0.3	1.1	0.1	0.7
Other revenue	0	0.1	0	12.3
Total revenues	0.3	1.2	0.1	13.0
Expenses
Loss and loss adjustment expenses	0	0.1	(0.7)	7.6
Insurance and reinsurance acquisition expenses	0.1	0.1	0.1	0.1
Other underwriting expenses	0.8	0.4	2.2	0.3
Total expenses	0.9	0.6	1.6	8.0
Pre-tax (loss) income	(0.6)	0.6	(1.5)	5.0
Income tax benefit (expense)	0.3	(0.2)	0.6	(0.2)
Net (loss) income from discontinued operations	(0.3)	0.4	(0.9)	4.8
Gain (Loss) on Disposal of Discontinued Operation	7.0	0	9.7	0
Net income from discontinued operations	$ 6.7	$ 0.4	$ 8.8	$ 4.8