Fair Value of Financial Instruments - Schedule of Financial Instruments Measured on Not Measured at Fair Value (Details) - USD ($) $ in Millions	Mar. 31, 2020	Dec. 31, 2019
Assets
Mortgage loans	$ 142.2	$ 183.5
Policy loans	18.9	19.1
Other invested assets	70.3	68.1
Nonrecurring \| Level 1
Assets
Mortgage loans	0.0	0.0
Policy loans	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	18.9	19.1
Total assets accounted for at fair value	18.9	19.1
Liabilities
Annuity benefits accumulated	0.0	0.0
Long-term obligations	675.9	768.9
Financial and Nonfinancial Liabilities, Fair Value Disclosure	675.9	768.9
Nonrecurring \| Level 3
Assets
Mortgage loans	142.3	183.5
Policy loans	0.0	0.0
Total assets accounted for at fair value	142.3	183.5
Liabilities
Annuity benefits accumulated	229.8	231.0
Long-term obligations	0.0	0.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	229.8	231.0
Nonrecurring \| Carrying Value
Assets
Mortgage loans	142.2	183.5
Policy loans	18.9	19.1
Total assets accounted for at fair value	161.1	202.6
Liabilities
Annuity benefits accumulated	232.5	233.9
Long-term obligations	684.6	772.0
Financial and Nonfinancial Liabilities, Fair Value Disclosure	917.1	1,005.9
Nonrecurring \| Estimated Fair Value
Assets
Mortgage loans	142.3	183.5
Policy loans	18.9	19.1
Total assets accounted for at fair value	161.2	202.6
Liabilities
Annuity benefits accumulated	229.8	231.0
Long-term obligations	675.9	768.9
Financial and Nonfinancial Liabilities, Fair Value Disclosure	$ 905.7	$ 999.9

Liability for Future Policy Benefits, Excluding Life

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- Definition

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.

+ References

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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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