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Summary of Accounting Policies and Accounting Changes - Narrative (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2020 | Sep. 30, 2020 | Jun. 30, 2020 | Mar. 31, 2020 | Dec. 31, 2019 | Sep. 30, 2019 | Jun. 30, 2019 | Mar. 31, 2019 | Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2016
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses | $ 863.4 | $ 877.5 | $ 747.5 | $ 835.2 | $ 814.9 | $ 782.6 | $ 825.4 | $ 765.4 | $ 3,323.6 | $ 3,188.3 | $ 2,466.5 |
Reinsurance recoverables | 50.1 |  |  |  | 122.6 |  |  |  | 50.1 | 122.6 |  |
Accrued investment income | 77.1 |  |  |  | 78.7 |  |  |  | 77.1 | 78.7 |  |
Company-owned Life Insurance | 327.4 |  |  |  | 217.0 |  |  |  | 327.4 | 217.0 |  |
Definite-lived intangible assets | 607.5 |  |  |  | 569.5 |  |  |  | 607.5 | 569.5 |  |
Present Value of Minimum Lease Payments | 0.2 |  |  |  |  |  |  |  | 0.2 |  |  |
Finite-lived intangible assets, net | $ 272.3 |  |  |  | 280.6 |  |  |  | $ 272.3 | 280.6 |  |
Life Insurance | Minimum |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate assumptions | 3.00% |  |  |  |  |  |  |  | 3.00% |  |  |
Life Insurance | Maximum |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Interest rate assumptions | 7.00% |  |  |  |  |  |  |  | 7.00% |  |  |
Change in Accounting Estimate, Use of Death Master File in Reserving Process |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Policyholders’ Benefits and Incurred Losses and Loss Adjustment Expenses |  |  |  |  |  |  |  |  |  |  |  | $ 77.8
Value of Business Acquired |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets | $ 194.5 |  |  |  | 194.5 |  |  |  | $ 194.5 | 194.5 |  |
Finite-lived intangible assets, net | 20.3 |  |  |  | 24.1 |  |  |  | 20.3 | 24.1 |  |
Customer Relationships |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets | 39.0 |  |  |  | 39.0 |  |  |  | 39.0 | 39.0 |  |
Finite-lived intangible assets, net | 3.4 |  |  |  | 4.3 |  |  |  | 3.4 | 4.3 |  |
Agent Relationships |  |  |  |  |  |  |  |  |  |  |  |
New Accounting Pronouncements or Change in Accounting Principle [Line Items] |  |  |  |  |  |  |  |  |  |  |  |
Definite-lived intangible assets | 74.4 |  |  |  | 74.4 |  |  |  | 74.4 | 74.4 |  |
Finite-lived intangible assets, net | $ 57.6 |  |  |  | $ 62.5 |  |  |  | $ 57.6 | $ 62.5 |  |

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