Income (Loss) from Discontinued Operations (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		6 Months Ended
	Jun. 30, 2014	Jun. 30, 2013	Jun. 30, 2014	Jun. 30, 2013
Revenues
Earned insurance premiums	$ 503.4	$ 497.5	$ 997.0	$ 992.9
Other revenue	6.4	0.4	3.0	28.7
Total revenues	652.8	489.3	1,231.1	1,116.7
Expenses
Loss and loss adjustment expenses	282.7	274.6	512.0	518.9
Insurance and reinsurance acquisition expenses	98.9	76.1	194.0	174.3
Other underwriting expenses	81.9	84.5	163.3	163.6
Total expenses	543.8	485.7	1,010.0	961.3
Net (loss) income from discontinued operations	2.6	3.9	2.1	4.4
Segment, Discontinued Operations
Revenues
Earned insurance premiums	(0.1)	(1.3)	(0.2)	(0.4)
Other revenue	0	12.2	0	12.2
Total revenues	(0.1)	10.9	(0.2)	11.8
Expenses
Loss and loss adjustment expenses	(0.7)	7.5	(0.7)	7.5
Insurance and reinsurance acquisition expenses	0	(0.1)	0	0
Other underwriting expenses	0.7	(0.2)	1.4	(0.1)
Total expenses	0	7.2	0.7	7.4
Pre-tax (loss) income	(0.1)	3.7	(0.9)	4.4
Income tax benefit	0	0.2	0.3	0
Net (loss) income from discontinued operations	(0.1)	3.9	(0.6)	4.4
Gain (Loss) on Disposal of Discontinued Operation	(0.5)	0	(0.5)	0
Net income from discontinued operations	2.6	3.9	2.1	4.4
Esurance | Segment, Discontinued Operations
Expenses
Gain (Loss) on Disposal of Discontinued Operation	$ 3.2	$ 0	$ 3.2	$ 0