Reinsurance (Premiums) (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Premiums:
Direct premiums	$ 36.2	$ 34.0	$ 67.6
Reinsurance assumed	0	0.1	0
Reinsurance ceded	(0.2)	(0.2)	(0.3)
Net premiums	$ 36.0	$ 33.9	$ 67.3