Investments (Details 13) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2015 item	Sep. 30, 2014 USD ($) item	Sep. 30, 2015 USD ($) item	Sep. 30, 2014 USD ($) item
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	2	39	13	80
Recorded investment of mortgage loans modified as a troubled debt restructuring | $		$ 7.0	$ 0.5	$ 13.5
Number of mortgage loans modified as a troubled debt restructuring in payment default	1	2	2	4
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default | $		$ 0.7		$ 0.7
Brick and mortar
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring		2		4
Recorded investment of mortgage loans modified as a troubled debt restructuring | $		$ 5.4		$ 10.5
Number of mortgage loans modified as a troubled debt restructuring in payment default		1		1
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default | $		$ 0.7		$ 0.7
Home equity
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	2	37	13	75
Recorded investment of mortgage loans modified as a troubled debt restructuring | $		$ 1.6	$ 0.5	$ 2.9
Number of mortgage loans modified as a troubled debt restructuring in payment default	1	1	2	3
First liens
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring				1
Recorded investment of mortgage loans modified as a troubled debt restructuring | $				$ 0.1