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Schedule 2 - Parent Company Financial Statements - Balance Sheets (Additional Information) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019 | Jun. 07, 2019
--- | --- | --- | ---
Amortized cost of fixed maturities | $ 6,692.7 | $ 6,372.7 |
Debt | $ 1,247.8 | $ 820.2 |
Senior Notes | Senior Notes Payable, 4.35% due 2025 (Fair Value: 2020 – $499.5; 2019 – $478.6) |  |  |
Stated interest rate, percentage | 4.35% | 4.35% |
Subordinated Debt | Subordinated Debentures due 2054 (Fair Value: 2018 – $151.1) |  |  |
Stated interest rate, percentage |  |  | 7.375%
Parent Company |  |  |
Amortized cost of fixed maturities | $ 91.8 |  |
Parent Company | Secured Debt | Term Loan due July 5, 2023 (Fair Value: 2020 – $50.0; 2019 – $50.0) |  |  |
Debt | 50.0 | $ 50.0 |
Parent Company | Senior Notes | Senior Notes Payable, 4.35% due 2025 (Fair Value: 2020 – $499.5; 2019 – $478.6) |  |  |
Debt | $ 499.5 | $ 478.6 |

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