Investments (Details 13) (USD $) In Millions, unless otherwise specified	3 Months Ended	6 Months Ended
	Jun. 30, 2012 item	Jun. 30, 2012 item
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	56	106
Recorded investment of mortgage loans modified as a troubled debt restructuring	$ 43.6	$ 50.3
Number of mortgage loans modified as a troubled debt restructuring in payment default	1	3
Brick and mortar
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	2	3
Recorded investment of mortgage loans modified as a troubled debt restructuring	41.4	45.8
Home equity
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	54	103
Recorded investment of mortgage loans modified as a troubled debt restructuring	$ 2.2	$ 4.5
Number of mortgage loans modified as a troubled debt restructuring in payment default	1	3