Investments (Details 13) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2014 item	Mar. 31, 2013 item
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	14	35
Recorded investment of mortgage loans modified as a troubled debt restructuring	$ 4.9	$ 3.1
Number of mortgage loans modified as a troubled debt restructuring in payment default	1	12
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default	0.2
Brick and mortar
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	1	1
Recorded investment of mortgage loans modified as a troubled debt restructuring	4.4	0.8
Number of mortgage loans modified as a troubled debt restructuring in payment default	1
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default	0.2
Home equity
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	13	32
Recorded investment of mortgage loans modified as a troubled debt restructuring	0.5	1.9
Number of mortgage loans modified as a troubled debt restructuring in payment default		12
First liens
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring		2
Recorded investment of mortgage loans modified as a troubled debt restructuring		$ 0.4