Investments (Details 13) (USD $) In Millions, unless otherwise specified	3 Months Ended		9 Months Ended
	Sep. 30, 2014 item	Sep. 30, 2013 item	Sep. 30, 2014 item	Sep. 30, 2013 item
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	39	12	80	65
Recorded investment of mortgage loans modified as a troubled debt restructuring	$ 7.0	$ 0.8	$ 13.5	$ 4.6
Number of mortgage loans modified as a troubled debt restructuring in payment default	2	1	4	16
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default	0.7	0.1	0.7	0.8
Brick and mortar
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring	2		4	2
Recorded investment of mortgage loans modified as a troubled debt restructuring	5.4		10.5	0.9
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	37	12	75	60
Recorded investment of mortgage loans modified as a troubled debt restructuring	1.6	0.8	2.9	3.1
Number of mortgage loans modified as a troubled debt restructuring in payment default	1		3	13
First liens
Mortgage Loan Modifications
Number of mortgage loans modified as a troubled debt restructuring			1	3
Recorded investment of mortgage loans modified as a troubled debt restructuring			0.1	0.6
Number of mortgage loans modified as a troubled debt restructuring in payment default		1		3
Recorded investment of mortgage loans modified as a troubled debt restructuring in payment default		$ 0.1		$ 0.8