Reinsurance - Other Reinsurance Activity (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2015	Jun. 30, 2014	Jun. 30, 2015	Jun. 30, 2014
Reinsurance Disclosures [Abstract]
Direct premiums	$ 17.8	$ 18.1	$ 34.8	$ 35.6
Premiums ceded to non-affiliates	(12.3)	(13.4)	(26.3)	(28.1)
Premiums	5.5	4.7	8.5	7.5
Direct policy benefits incurred	72.7	41.9	194.0	79.8
Policy benefits assumed from non-affiliates	0.0	0.0	0.2	0.1
Policy benefits ceded to, affiliates	(12.0)	(5.0)	(26.9)	(5.0)
Policy benefits ceded to, ceded, non-affiliates	(10.2)	(21.4)	(51.5)	(40.7)
Policy benefits ceded	(22.2)	(26.4)	(78.4)	(45.7)
Premiums Paid To Reinsurers, Affiliates	6.0	5.9	12.1	12.1
Premiums Paid To Reinsurers, Non-Affiliates	9.3	8.3	23.8	21.8
Premiums paid to reinsurers	15.3	14.2	35.9	33.9
Policy benefits	65.8	29.7	151.7	68.1
Policyholder benefits and claims incurred life and annuity, changes in reserves, interest credited, and other adjustments	$ 48.9	$ 55.2	$ 62.7	$ 88.9