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Summary of Accounting Policies and Accounting Changes - Narrative (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses | $ 4,600.8 | $ 3,323.6 | $ 3,188.3
Reinsurance recoverables | 41.9 | 50.1 |
Accrued investment income | 79.6 | 77.1 |
Company-Owned Life Insurance | 448.1 | 327.4 |
Definite-lived intangible assets | 706.4 | 607.5 |
Finite-lived intangible assets, net | 292.9 | $ 272.3 |
Life Insurance | Minimum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Interest rate assumptions |  | 3.00% |
Life Insurance | Maximum |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Interest rate assumptions |  | 7.00% |
Value of Business Acquired |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Definite-lived intangible assets | 237.5 | $ 194.5 |
Finite-lived intangible assets, net | 19.0 | 20.3 |
Customer Relationships |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Definite-lived intangible assets | 43.8 | 39.0 |
Finite-lived intangible assets, net | 5.7 | 3.4 |
Agent Relationships |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |
Definite-lived intangible assets | 81.6 | 74.4 |
Finite-lived intangible assets, net | $ 58.0 | $ 57.6 |

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