Fair Value of Financial Instruments - Schedule of Financial Instruments Measured on Not Measured at Fair Value (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018
Assets
Mortgage loans	$ 183.5	$ 137.6
Policy loans	19.1	19.8
Other invested assets	85.0	72.5
Nonrecurring \| Level 1
Assets
Mortgage loans	0.0	0.0
Policy loans	0.0	0.0
Other invested assets	0.0	0.0
Total assets accounted for at fair value	0.0	0.0
Liabilities
Annuity benefits accumulated	0.0	0.0
Long-term obligations	0.0	0.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	0.0	0.0
Nonrecurring \| Level 2
Assets
Mortgage loans	0.0	0.0
Policy loans	19.1	19.8
Other invested assets	0.0	0.0
Total assets accounted for at fair value	19.1	19.8
Liabilities
Annuity benefits accumulated	0.0	0.0
Long-term obligations	801.6	703.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	801.6	703.0
Nonrecurring \| Level 3
Assets
Mortgage loans	183.5	137.6
Policy loans	0.0	0.0
Other invested assets	0.0	1.6
Total assets accounted for at fair value	183.5	139.2
Liabilities
Annuity benefits accumulated	231.0	241.7
Long-term obligations	0.0	0.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	231.0	241.7
Nonrecurring \| Carrying Value
Assets
Mortgage loans	183.5	137.6
Policy loans	19.1	19.8
Other invested assets	0.0	1.6
Total assets accounted for at fair value	202.6	159.0
Liabilities
Annuity benefits accumulated	233.9	244.0
Long-term obligations	804.7	702.5
Financial and Nonfinancial Liabilities, Fair Value Disclosure	1,038.6	946.5
Nonrecurring \| Estimated Fair Value
Assets
Mortgage loans	183.5	137.6
Policy loans	19.1	19.8
Other invested assets	0.0	1.6
Total assets accounted for at fair value	202.6	159.0
Liabilities
Annuity benefits accumulated	231.0	241.7
Long-term obligations	801.6	703.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 1,032.6	$ 944.7

Liability for Future Policy Benefits, Excluding Life

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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Fair value of financial and nonfinancial obligations.

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Amount of investment in mortgage loan on real estate by entity with substantial portion of business acquiring and holding investment real estate or interest in real estate.

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-Publisher FASB
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Amount of investments classified as other.

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Carrying amount of loans made to policyholders against the cash surrender value (CSV) or other policyholder funds, and secured by the CSV, policyholder funds or the death benefit provided by the insurance contracts.

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