Reinsurance - Other Reinsurance Activity (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended				9 Months Ended
	Sep. 30, 2014		Sep. 30, 2013		Sep. 30, 2014		Sep. 30, 2013
Direct Business and Reinsurance:
Direct premiums	$ 15.8		$ 18.2		$ 51.4		$ 60.3
Premiums ceded to non-affiliate reinsurers	(12.8)	[1]	(15.1)	[1]	(40.9)	[1]	(49.0)	[1]
Premiums	3.0		3.1		10.5		11.3
Direct policy benefits incurred	50.2		87.2		130.0		184.6
Policy benefits assumed from non-affiliates	0		0		0.1		0
Policy benefits ceded to:
Affiliates	(0.1)		0		(5.1)		(9.0)
Non-affiliates	(17.0)		(50.5)		(57.7)		(84.5)
Policy benefits ceded	(17.1)		(50.5)		(62.8)		(93.5)
Premiums paid to:
Affiliates	5.5		5.5		17.6		16.6
Non-affiliates	18.8		17.1		40.6		27.8
Premiums paid to reinsurers	24.3	[2]	22.6	[2]	58.2	[2]	44.4	[2]
Policy benefits	57.4	[3]	59.3	[3]	125.5	[3]	135.5	[3]
Changes in reserves, interest credited to policyholders and withdrawals amount	$ 39.5		$ 32.5		$ 128.5		$ 136.2

[1] Primarily represents premiums ceded to reinsurers related to term insurance policies.

[2] For universal life and variable universal life contracts, premiums paid to reinsurers are reflected within policy benefits. See Note 2 to these interim unaudited financial statements for additional information regarding significant accounting policies.

[3] Policy benefit amounts above exclude changes in reserves, interest credited to policyholders and other items, which total $39.5 million and $32.5 million, net of reinsurance, for the three months ended September 30, 2014 and 2013, respectively, and $128.5 million and $136.2 million, net of reinsurance, for the nine months ended September 30, 2014 and 2013, respectively.