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Fair Value - Summary of Changes in Fair Value Associated with Level 3 Assets (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | $ 113.8 | $ 122.4 | $ 110.1 | $ 121.9
Calls/ Maturities/ Paydowns | (0.4) | 1.6 | 3.3 | 2.1
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Net Realized (Gain)/Loss on Sales | 0.0 | 0.0 | 0.0 | 0.0
Change in Valuation | (12.1) | (12.0) | (12.1) | (12.0)
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | 101.3 | 112.0 | 101.3 | 112.0
Corporate debt securities |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 3.0 |  | 3.0 |
Calls/ Maturities/ Paydowns | 0.0 |  | 0.0 |
Purchases | 0.0 |  | 0.0 |
Sales | 0.0 |  | 0.0 |
Net Realized (Gain)/Loss on Sales | 0.0 |  | 0.0 |
Change in Valuation | 0.0 |  | 0.0 |
Net Transfers In (Out) | 0.0 |  | 0.0 |
Fair value, ending balance | 3.0 |  | 3.0 |
Nonredeemable preferred stocks | Financials |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 49.2 | 67.4 | 49.2 | 67.4
Calls/ Maturities/ Paydowns | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Net Realized (Gain)/Loss on Sales | 0.0 | 0.0 | 0.0 | 0.0
Change in Valuation | (12.5) | (11.4) | (12.5) | (11.4)
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | 36.7 | 56.0 | 36.7 | 56.0
Nonredeemable preferred stocks | Industrials |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 14.8 | 16.4 | 14.8 | 16.4
Calls/ Maturities/ Paydowns | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Net Realized (Gain)/Loss on Sales | 0.0 | 0.0 | 0.0 | 0.0
Change in Valuation | 0.4 | (0.6) | 0.4 | (0.6)
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | 15.2 | 15.8 | 15.2 | 15.8
Common equities | Common Stocks, excluding Other Risk |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 22.5 | 18.3 | 22.5 | 18.3
Calls/ Maturities/ Paydowns | 0.0 | 0.0 | 0.0 | 0.0
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Net Realized (Gain)/Loss on Sales | 0.0 | 0.0 | 0.0 | 0.0
Change in Valuation | 0.0 | 0.0 | 0.0 | 0.0
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | 22.5 | 18.3 | 22.5 | 18.3
Common equities | Other risk investments |  |  |  |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation, Calculation [Roll Forward] |  |  |  |
Fair value, beginning balance | 24.3 | 20.3 | 20.6 | 19.8
Calls/ Maturities/ Paydowns | (0.4) | 1.6 | 3.3 | 2.1
Purchases | 0.0 | 0.0 | 0.0 | 0.0
Sales | 0.0 | 0.0 | 0.0 | 0.0
Net Realized (Gain)/Loss on Sales | 0.0 | 0.0 | 0.0 | 0.0
Change in Valuation | 0.0 | 0.0 | 0.0 | 0.0
Net Transfers In (Out) | 0.0 | 0.0 | 0.0 | 0.0
Fair value, ending balance | $ 23.9 | $ 21.9 | $ 23.9 | $ 21.9

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