New Accounting Guidance (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2012	Sep. 30, 2011	Sep. 30, 2012	Sep. 30, 2011
Previous Accounting Guidance [Member]
Deferred Policy Acquisition Costs and Value of Business Acquired [Abstract]
Deferred policy acquisition costs		$ 1.2		$ 3.9
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	$ 2.6	$ 1.8	$ 6.7	$ 5.2