Reinsurance (Details) (USD $) In Millions, unless otherwise specified						3 Months Ended
	Mar. 31, 2014		Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012	Mar. 31, 2014 MPCI Portfolio [Member]	Mar. 31, 2014 Crop-Hail Portfolio [Member]	Mar. 31, 2014 Segment, Discontinued Operations	Dec. 31, 2013 Segment, Discontinued Operations rating	Mar. 31, 2014 Segment, Discontinued Operations Munich Reinsurance America	Mar. 31, 2014 Standard & Poor's, AA Rating [Member]		Mar. 31, 2014 Standard & Poor's, A Rating [Member]		Mar. 31, 2014 Standard & Poor's, BBB+ Rating [Member]
Reinsurance Retention Policy [Line Items]
Coverage in Excess of Retained Amount						48.50%	80.00%
Retained Losses						101.50%	100.00%
Reinsurance recoverable on paid losses	$ 3.0
Reinsurance recoverable on unpaid losses	80.1		80.2	105.8	107.3			1,673.6	1,741.6
Reinsurance recoverables	$ 83.1	[1]	$ 89.9							$ 14.1	$ 26.1	[1]	$ 51.7	[1]	$ 5.3	[1]
Percentage of total paid and unpaid reinsurance recoverables	100.00%	[1]								1.00%	31.00%	[1]	62.00%	[1]	7.00%	[1]
Number of ratings in A.M. Best ratings									16

[1] Standard & Poor's ratings as detailed above are "AA" (Very strong), "A" (Strong) and "BBB+" (Adequate).