New Accounting Policies (Details) (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011
Previous Accounting Guidance [Member]
Deferred Policy Acquisition Costs and Value of Business Acquired [Abstract]
Deferred policy acquisition costs		$ 5.2
New Guidance on Accounting for Costs Associated with Acquiring or Renewing Insurance Contracts [Member]
Deferred Policy Acquisition Costs and Value of Business Acquired [Abstract]
Deferred policy acquisition costs	$ 9.2	$ 7.2