Reinsurance (Details 2) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 item	Dec. 31, 2013	Mar. 31, 2013	Dec. 31, 2012
Reinsurance recoverable on paid and unpaid losses
Total reinsurance recoverable on paid losses	$ 4.3	$ 3.6
Percentage of the total reinsurance recoverable on paid losses	100.00%	100.00%
Total reinsurance recoverable on unpaid losses	55.0	63.6	86.6	102.7
Percentage of the total reinsurance recoverable on unpaid losses	100.00%	100.00%
Reinsurance Disputes
Number of disputed reinsurance contracts	0
A.M. Best, A+ rating
Reinsurance recoverable on paid and unpaid losses
Total reinsurance recoverable on paid losses	2.3	0.7
Percentage of the total reinsurance recoverable on paid losses	53.00%	19.00%
Total reinsurance recoverable on unpaid losses	24.4	28.6
Percentage of the total reinsurance recoverable on unpaid losses	44.00%	45.00%
A.M. Best, A rating
Reinsurance recoverable on paid and unpaid losses
Total reinsurance recoverable on paid losses	0.7	1.4
Percentage of the total reinsurance recoverable on paid losses	16.00%	39.00%
Total reinsurance recoverable on unpaid losses	19.8	20.2
Percentage of the total reinsurance recoverable on unpaid losses	36.00%	32.00%
AM Best, A- Rating
Reinsurance recoverable on paid and unpaid losses
Total reinsurance recoverable on paid losses	0.2
Percentage of the total reinsurance recoverable on paid losses	5.00%
Total reinsurance recoverable on unpaid losses	2.8	4.2
Percentage of the total reinsurance recoverable on unpaid losses	5.00%	6.00%
Unrated by A.M. Best
Reinsurance recoverable on paid and unpaid losses
Total reinsurance recoverable on paid losses	1.1	1.5
Percentage of the total reinsurance recoverable on paid losses	26.00%	42.00%
Total reinsurance recoverable on unpaid losses	$ 8.0	$ 10.6
Percentage of the total reinsurance recoverable on unpaid losses	15.00%	17.00%