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Acquisitions - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Millions | Jan. 01, 2022 | Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | --- | --- | --- | ---
Liabilities: |  |  |  |  |
Goodwill |  | $ 54.3 | $ 43.5 | $ 43.5 | $ 49.1
Madison National |  |  |  |  |
Assets |  |  |  |  |
Investments | $ 90.4 |  |  |  |
Cash and short-term investments | 123.4 |  |  |  |
Reinsurance recoverable | 356.0 |  |  |  |
Intangible assets | 59.4 | $ 56.5 |  |  |
Other assets | 23.2 |  |  |  |
Liabilities: |  |  |  |  |
Investment contract and policy reserves | 274.5 |  |  |  |
Unpaid claims and claim expenses | 48.2 |  |  |  |
Unearned premiums | 1.5 |  |  |  |
Other policyholder funds | 152.8 |  |  |  |
Other liabilities | 15.9 |  |  |  |
Total identifiable net assets acquired | 159.5 |  |  |  |
Goodwill | 12.8 |  |  |  |
Purchase price | 172.3 |  |  |  |
Goodwill expected to be deductible for tax purposes | $ 18.6 |  |  |  |
Madison National | Minimum |  |  |  |  |
Liabilities: |  |  |  |  |
Acquired finite-lived intangible assets, useful lives | 1 year |  |  |  |
Madison National | Maximum |  |  |  |  |
Liabilities: |  |  |  |  |
Acquired finite-lived intangible assets, useful lives | 10 years |  |  |  |

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