Schedule for Carrying Amounts and Fair Values of Financial Instruments (Details) (USD $) In Millions, unless otherwise specified	Dec. 31, 2014	Dec. 31, 2013
Level 3 | Policy loans
Carrying Amounts and Fair Values of Financial Instruments:
Carrying Value	$ 68.1	$ 66.1
Fair Value	67.6	65.6
Level 3 | Investment contracts
Carrying Amounts and Fair Values of Financial Instruments:
Carrying Value	3,306.9	2,775.2
Fair Value	3,308.6	2,776.2
Level 3 | Surplus Note
Carrying Amounts and Fair Values of Financial Instruments:
Carrying Value	30.0	30.0
Fair Value	30.0	30.0
Level 1 | Cash and cash equivalent
Carrying Amounts and Fair Values of Financial Instruments:
Carrying Value	162.3	181.0
Fair Value	$ 162.3	$ 181.0