Committments and Contingencies (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Unrecorded Unconditional Purchase Obligation [Line Items]
Change in state insurance guaranty fund	$ (0.1)	$ (0.1)	$ (0.1)
Deferred Revenue, Noncurrent	0.9	1.0
Operating Leases, Rent Expense	4.1	4.0	4.3
Deferred Revenue, Revenue Recognized	(0.2)	$ (0.2)	$ (0.2)
Operating Leases, Future Minimum Payments Due, Next Twelve Months	2.1
Operating Leases, Future Minimum Payments, Due in Two Years	2.1
Operating Leases, Future Minimum Payments, Due in Three Years	2.1
Operating Leases, Future Minimum Payments, Due in Four Years	2.1
Operating Leases, Future Minimum Payments, Due in Five Years	2.1
Operating Leases, Future Minimum Payments, Due Thereafter	$ 2.1