Summary of Significant Accounting Policies (Details 3) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Deferred Policy Acquisition Costs
Policy acquisition costs deferred	$ 6.6	$ 6.6	$ 5.7
Other underwriting and operating expenses
Deferred Policy Acquisition Costs
Amortization of deferred policy acquisition costs	$ 4.7	$ 3.2	$ 1.7