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Investments - Net Investment Income (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2023 | Jun. 30, 2022 | Jun. 30, 2023 | Jun. 30, 2022
Net Investment Income [Line Items] |  |  |  |
Investment income | $ 120.7 | $ 127.6 | $ 233.5 | $ 236.5
Investment expenses | 14.4 | 9.1 | 25.4 | 18.0
Net Investment Income | 106.3 | 118.5 | 208.1 | 218.5
Fixed Maturities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 87.1 | 72.8 | 173.3 | 141.5
Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 1.2 | 1.7 | 2.2 | 3.2
Total Alternative Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 9.1 | 33.8 | 12.8 | 54.7
Equity Method Limited Liability Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 2.8 | 15.3 | 3.9 | 28.6
Limited Liability Investments Included in Equity Securities |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 6.3 | 18.5 | 8.9 | 26.1
Short-term Investments |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 3.6 | 0.2 | 5.9 | 0.3
Loans to Policyholders |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 5.1 | 5.3 | 10.5 | 10.8
Real Estate |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 1.9 | 2.3 | 4.3 | 4.5
Investment expenses | 2.2 | 1.0 | 4.3 | 3.5
Other Investment Expenses |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment expenses | 12.2 | 8.1 | 21.1 | 14.5
Universal Life-type Policyholder Account Balances |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | 5.3 | 1.7 | 8.3 | 3.4
Cash Surrender Value |  |  |  |
Net Investment Income [Line Items] |  |  |  |
Investment income | $ 7.4 | $ 9.8 | $ 16.2 | $ 18.1

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