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Basis of Presentation and Significant Accounting Policies - Adjustments to Amortization Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
(Decrease) increase to DAC amortization expense: |  |  |
Total | $ (1.5) | $ (2.1) | $ 3.2
Retirement |  |  |
(Decrease) increase to DAC amortization expense: |  |  |
Total | (1.3) | (1.8) | 3.5
Life |  |  |
(Decrease) increase to DAC amortization expense: |  |  |
Total | $ (0.2) | $ (0.3) | $ (0.3)

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- Definition Amount of amortization expense (reversal of amortization expense) of deferred policy acquisition costs from a revision in estimated gross profit or estimated gross margin. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=35755530&loc=d3e11264-158415 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 30 -Section 35 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=124506905&loc=d3e10129-158409 + Details
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