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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | $ 98.7 | $ 113.2 | $ 207.0 | $ 221.3
Investment expenses | 5.7 | 6.9 | 13.6 | 13.2
Net Investment Income | 93.0 | 106.3 | 193.4 | 208.1
Fixed Maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | 80.2 | 79.6 | 160.0 | 161.1
Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | 0.9 | 1.2 | 3.7 | 2.2
Total Alternative Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | (8.5) | 9.1 | (7.2) | 12.8
Equity Method Limited Liability Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | (14.7) | 2.8 | (16.8) | 3.9
Limited Liability Investments Included in Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | 6.2 | 6.3 | 9.6 | 8.9
Short-term Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | 7.3 | 3.6 | 14.6 | 5.9
Loans to Policyholders |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | 5.1 | 5.1 | 10.3 | 10.5
Real Estate |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | 2.2 | 1.9 | 4.5 | 4.3
Investment expenses | 2.1 | 2.2 | 4.3 | 4.3
Other Investment Expenses |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment expenses | 3.6 | 4.7 | 9.3 | 8.9
Interest Expense, Other Short-Term Borrowings | 5.4 | 7.5 | 10.6 | 12.2
Cash Surrender Value |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | 8.9 | 7.4 | 16.0 | 16.2
Universal Life-type Policyholder Account Balances |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income (loss) | $ 2.6 | $ 5.3 | $ 5.1 | $ 8.3

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