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Fair Value (Tables) | 6 Months Ended
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Jun. 30, 2024
Fair Value Disclosures [Abstract] |
Composition of Investment Portfolio by Major Security Type | The composition of the investment portfolio by major security type and our outstanding debt was:
| Fair Value |  |
(millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Cost
June 30, 2024 |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |
U.S. government obligations | $ | 40,894.0 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 40,894.0 |  |  | $ | 42,063.1 |
State and local government obligations | 0 |  |  | 2,202.0 |  |  | 0 |  |  | 2,202.0 |  |  | 2,345.6 |
Foreign government obligations | 0 |  |  | 15.8 |  |  | 0 |  |  | 15.8 |  |  | 16.7 |
Corporate debt securities | 0 |  |  | 12,971.6 |  |  | 3.0 |  |  | 12,974.6 |  |  | 13,260.0 |
Subtotal | 40,894.0 |  |  | 15,189.4 |  |  | 3.0 |  |  | 56,086.4 |  |  | 57,685.4 |
Asset-backed securities: |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 0 |  |  | 975.7 |  |  | 0 |  |  | 975.7 |  |  | 980.4 |
Commercial mortgage-backed | 0 |  |  | 3,970.0 |  |  | 0 |  |  | 3,970.0 |  |  | 4,457.2 |
Other asset-backed | 0 |  |  | 6,284.7 |  |  | 0 |  |  | 6,284.7 |  |  | 6,366.4 |
Subtotal asset-backed securities | 0 |  |  | 11,230.4 |  |  | 0 |  |  | 11,230.4 |  |  | 11,804.0 |
Redeemable preferred stocks: |  |  |  |  |  |  |  |  |
Financials | 0 |  |  | 23.1 |  |  | 0 |  |  | 23.1 |  |  | 24.5 |
Utilities | 0 |  |  | 13.4 |  |  | 0 |  |  | 13.4 |  |  | 13.9 |
Industrials | 0 |  |  | 135.0 |  |  | 0 |  |  | 135.0 |  |  | 140.4 |
Subtotal redeemable preferred stocks | 0 |  |  | 171.5 |  |  | 0 |  |  | 171.5 |  |  | 178.8 |
Total fixed maturities | 40,894.0 |  |  | 26,591.3 |  |  | 3.0 |  |  | 67,488.3 |  |  | 69,668.2 |
Short-term investments | 733.4 |  |  | 0 |  |  | 0 |  |  | 733.4 |  |  | 733.4 |
Total available-for-sale securities | 41,627.4 |  |  | 26,591.3 |  |  | 3.0 |  |  | 68,221.7 |  |  | 70,401.6 |
Equity securities: |  |  |  |  |  |  |  |  |
Nonredeemable preferred stocks: |  |  |  |  |  |  |  |  |
Financials | 0 |  |  | 748.8 |  |  | 36.7 |  |  | 785.5 |  |  | 831.9 |
Utilities | 0 |  |  | 37.5 |  |  | 0 |  |  | 37.5 |  |  | 40.0 |
Industrials | 0 |  |  | 0 |  |  | 15.2 |  |  | 15.2 |  |  | 15.0 |
Subtotal nonredeemable preferred stocks | 0 |  |  | 786.3 |  |  | 51.9 |  |  | 838.2 |  |  | 886.9 |
Common equities: |  |  |  |  |  |  |  |  |
Common stocks | 3,249.2 |  |  | 0 |  |  | 22.5 |  |  | 3,271.7 |  |  | 683.9 |
Other risk investments | 0 |  |  | 0 |  |  | 23.9 |  |  | 23.9 |  |  | 23.9 |
Subtotal common equities | 3,249.2 |  |  | 0 |  |  | 46.4 |  |  | 3,295.6 |  |  | 707.8 |
Total equity securities | 3,249.2 |  |  | 786.3 |  |  | 98.3 |  |  | 4,133.8 |  |  | 1,594.7 |
Total portfolio | $ | 44,876.6 |  |  | $ | 27,377.6 |  |  | $ | 101.3 |  |  | $ | 72,355.5 |  |  | $ | 71,996.3 |
Debt | $ | 0 |  |  | $ | 6,165.5 |  |  | $ | 0 |  |  | $ | 6,165.5 |  |  | $ | 6,890.7 |
| Fair Value |  |
(millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Cost
June 30, 2023 |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |
U.S. government obligations | $ | 31,600.5 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 31,600.5 |  |  | $ | 33,277.1 |
State and local government obligations | 0 |  |  | 2,154.7 |  |  | 0 |  |  | 2,154.7 |  |  | 2,336.5 |
Foreign government obligations | 0 |  |  | 15.8 |  |  | 0 |  |  | 15.8 |  |  | 17.2 |
Corporate debt securities | 0 |  |  | 10,304.6 |  |  | 0 |  |  | 10,304.6 |  |  | 10,866.4 |
Subtotal | 31,600.5 |  |  | 12,475.1 |  |  | 0 |  |  | 44,075.6 |  |  | 46,497.2 |
Asset-backed securities: |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 0 |  |  | 562.7 |  |  | 0 |  |  | 562.7 |  |  | 580.7 |
Commercial mortgage-backed | 0 |  |  | 4,265.5 |  |  | 0 |  |  | 4,265.5 |  |  | 4,982.2 |
Other asset-backed | 0 |  |  | 5,017.6 |  |  | 0 |  |  | 5,017.6 |  |  | 5,250.6 |
Subtotal asset-backed securities | 0 |  |  | 9,845.8 |  |  | 0 |  |  | 9,845.8 |  |  | 10,813.5 |
Redeemable preferred stocks: |  |  |  |  |  |  |  |  |
Financials | 0 |  |  | 22.0 |  |  | 0 |  |  | 22.0 |  |  | 24.5 |
Utilities | 0 |  |  | 9.3 |  |  | 0 |  |  | 9.3 |  |  | 10.4 |
Industrials | 0 |  |  | 125.4 |  |  | 0 |  |  | 125.4 |  |  | 139.1 |
Subtotal redeemable preferred stocks | 0 |  |  | 156.7 |  |  | 0 |  |  | 156.7 |  |  | 174.0 |
Total fixed maturities | 31,600.5 |  |  | 22,477.6 |  |  | 0 |  |  | 54,078.1 |  |  | 57,484.7 |
Short-term investments | 1,462.2 |  |  | 32.1 |  |  | 0 |  |  | 1,494.3 |  |  | 1,494.3 |
Total available-for-sale securities | 33,062.7 |  |  | 22,509.7 |  |  | 0 |  |  | 55,572.4 |  |  | 58,979.0 |
Equity securities: |  |  |  |  |  |  |  |  |
Nonredeemable preferred stocks: |  |  |  |  |  |  |  |  |
Financials | 15.8 |  |  | 824.8 |  |  | 56.0 |  |  | 896.6 |  |  | 1,012.1 |
Utilities | 0 |  |  | 72.7 |  |  | 0 |  |  | 72.7 |  |  | 80.0 |
Industrials | 0 |  |  | 0 |  |  | 15.8 |  |  | 15.8 |  |  | 15.0 |
Subtotal nonredeemable preferred stocks | 15.8 |  |  | 897.5 |  |  | 71.8 |  |  | 985.1 |  |  | 1,107.1 |
Common equities: |  |  |  |  |  |  |  |  |
Common stocks | 2,667.9 |  |  | 0 |  |  | 18.3 |  |  | 2,686.2 |  |  | 640.1 |
Other risk investments | 0 |  |  | 0 |  |  | 21.9 |  |  | 21.9 |  |  | 21.9 |
Subtotal common equities | 2,667.9 |  |  | 0 |  |  | 40.2 |  |  | 2,708.1 |  |  | 662.0 |
Total equity securities | 2,683.7 |  |  | 897.5 |  |  | 112.0 |  |  | 3,693.2 |  |  | 1,769.1 |
Total portfolio | $ | 35,746.4 |  |  | $ | 23,407.2 |  |  | $ | 112.0 |  |  | $ | 59,265.6 |  |  | $ | 60,748.1 |
Debt | $ | 0 |  |  | $ | 6,224.0 |  |  | $ | 0 |  |  | $ | 6,224.0 |  |  | $ | 6,886.5 |
| Fair Value |  |
(millions) | Level 1 |  | Level 2 |  | Level 3 |  | Total |  | Cost
December 31, 2023 |  |  |  |  |  |  |  |  |
Fixed maturities: |  |  |  |  |  |  |  |  |
U.S. government obligations | $ | 36,869.4 |  |  | $ | 0 |  |  | $ | 0 |  |  | $ | 36,869.4 |  |  | $ | 37,823.2 |
State and local government obligations | 0 |  |  | 2,202.8 |  |  | 0 |  |  | 2,202.8 |  |  | 2,338.4 |
Foreign government obligations | 0 |  |  | 16.3 |  |  | 0 |  |  | 16.3 |  |  | 17.3 |
Corporate debt securities | 0 |  |  | 11,180.7 |  |  | 3.0 |  |  | 11,183.7 |  |  | 11,446.0 |
Subtotal | 36,869.4 |  |  | 13,399.8 |  |  | 3.0 |  |  | 50,272.2 |  |  | 51,624.9 |
Asset-backed securities: |  |  |  |  |  |  |  |  |
Residential mortgage-backed | 0 |  |  | 417.2 |  |  | 0 |  |  | 417.2 |  |  | 426.9 |
Commercial mortgage-backed | 0 |  |  | 3,939.7 |  |  | 0 |  |  | 3,939.7 |  |  | 4,535.2 |
Other asset-backed | 0 |  |  | 5,575.4 |  |  | 0 |  |  | 5,575.4 |  |  | 5,667.2 |
Subtotal asset-backed securities | 0 |  |  | 9,932.3 |  |  | 0 |  |  | 9,932.3 |  |  | 10,629.3 |
Redeemable preferred stocks: |  |  |  |  |  |  |  |  |
Financials | 0 |  |  | 23.1 |  |  | 0 |  |  | 23.1 |  |  | 24.5 |
Utilities | 0 |  |  | 9.4 |  |  | 0 |  |  | 9.4 |  |  | 10.4 |
Industrials | 0 |  |  | 141.2 |  |  | 0 |  |  | 141.2 |  |  | 152.8 |
Subtotal redeemable preferred stocks | 0 |  |  | 173.7 |  |  | 0 |  |  | 173.7 |  |  | 187.7 |
Total fixed maturities | 36,869.4 |  |  | 23,505.8 |  |  | 3.0 |  |  | 60,378.2 |  |  | 62,441.9 |
Short-term investments | 1,757.0 |  |  | 32.9 |  |  | 0 |  |  | 1,789.9 |  |  | 1,789.9 |
Total available-for-sale securities | 38,626.4 |  |  | 23,538.7 |  |  | 3.0 |  |  | 62,168.1 |  |  | 64,231.8 |
Equity securities: |  |  |  |  |  |  |  |  |
Nonredeemable preferred stocks: |  |  |  |  |  |  |  |  |
Financials | 0 |  |  | 802.7 |  |  | 49.2 |  |  | 851.9 |  |  | 922.1 |
Utilities | 0 |  |  | 35.4 |  |  | 0 |  |  | 35.4 |  |  | 40.0 |
Industrials | 0 |  |  | 0 |  |  | 14.8 |  |  | 14.8 |  |  | 15.0 |
Subtotal nonredeemable preferred stocks | 0 |  |  | 838.1 |  |  | 64.0 |  |  | 902.1 |  |  | 977.1 |
Common equities: |  |  |  |  |  |  |  |  |
Common stocks | 2,885.3 |  |  | 0 |  |  | 22.5 |  |  | 2,907.8 |  |  | 685.4 |
Other risk investments | 0 |  |  | 0 |  |  | 20.6 |  |  | 20.6 |  |  | 20.6 |
Subtotal common equities | 2,885.3 |  |  | 0 |  |  | 43.1 |  |  | 2,928.4 |  |  | 706.0 |
Total equity securities | 2,885.3 |  |  | 838.1 |  |  | 107.1 |  |  | 3,830.5 |  |  | 1,683.1 |
Total portfolio | $ | 41,511.7 |  |  | $ | 24,376.8 |  |  | $ | 110.1 |  |  | $ | 65,998.6 |  |  | $ | 65,914.9 |
Debt | $ | 0 |  |  | $ | 6,431.3 |  |  | $ | 0 |  |  | $ | 6,431.3 |  |  | $ | 6,888.6 |
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation | The following tables provide a summary of changes in fair value associated with Level 3 assets for the three and six months ended June 30, 2024 and 2023:
| Level 3 Fair Value
(millions) | Fair Value at March 31, 2024 | Calls/ Maturities/ Paydowns/Other | Purchases | Sales | Net Realized (Gain)/Loss on Sales | Change in Valuation 1 | Net Transfers In (Out) | Fair Value at June 30, 2024
Fixed maturities: |  |  |  |  |  |  |  |
Corporate debt securities | $ | 3.0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 3.0 |
Equity securities: |  |  |  |  |  |  |  |
Nonredeemable preferred stocks: |  |  |  |  |  |  |  |
Financials | 49.2 |  | 0 |  | 0 |  | 0 |  | 0 |  | (12.5) |  | 0 |  | 36.7 |
Industrials | 14.8 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0.4 |  | 0 |  | 15.2 |
Common equities: |  |  |  |  |  |  |  |
Common stocks | 22.5 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 22.5 |
Other risk investments | 24.3 |  | (0.4) |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 23.9 |
Total Level 3 securities | $ | 113.8 |  | $ | (0.4) |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | (12.1) |  | $ | 0 |  | $ | 101.3 |
| Level 3 Fair Value
(millions) | Fair Value at March 31, 2023 | Calls/ Maturities/ Paydowns/Other | Purchases | Sales | Net Realized (Gain)/Loss on Sales | Change in Valuation 1 | Net Transfers In (Out) | Fair Value at June 30, 2023
Equity securities: |  |  |  |  |  |  |  |
Nonredeemable preferred stocks: |  |  |  |  |  |  |  |
Financials | $ | 67.4 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | (11.4) |  | $ | 0 |  | $ | 56.0 |
Industrials | 16.4 |  | 0 |  | 0 |  | 0 |  | 0 |  | (0.6) |  | 0 |  | 15.8 |
Common equities: |  |  |  |  |  |  |  |
Common stocks | 18.3 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 18.3 |
Other risk investments | 20.3 |  | 1.6 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 21.9 |
Total Level 3 securities | $ | 122.4 |  | $ | 1.6 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | (12.0) |  | $ | 0 |  | $ | 112.0 |
| Level 3 Fair Value
(millions) | Fair Value at December 31, 2023 | Calls/ Maturities/ Paydowns/Other | Purchases | Sales | Net Realized (Gain)/Loss on Sales | Change in Valuation 1 | Net Transfers In (Out) | Fair Value at June 30, 2024
Fixed maturities: |  |  |  |  |  |  |  |
Corporate debt securities | $ | 3.0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 3.0 |
Equity securities: |  |  |  |  |  |  |  |
Nonredeemable preferred stocks: |  |  |  |  |  |  |  |
Financials | 49.2 |  | 0 |  | 0 |  | 0 |  | 0 |  | (12.5) |  | 0 |  | 36.7 |
Industrials | 14.8 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0.4 |  | 0 |  | 15.2 |
Common equities: |  |  |  |  |  |  |  |
Common stocks | 22.5 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 22.5 |
Other risk investments | 20.6 |  | 3.3 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 23.9 |
Total Level 3 securities | $ | 110.1 |  | $ | 3.3 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | (12.1) |  | $ | 0 |  | $ | 101.3 |
| Level 3 Fair Value
(millions) | Fair Value at December 31, 2022 | Calls/ Maturities/ Paydowns/Other | Purchases | Sales | Net Realized (Gain)/Loss on Sales | Change in Valuation 1 | Net Transfers In (Out) | Fair Value at June 30, 2023
Equity securities: |  |  |  |  |  |  |  |
Nonredeemable preferred stocks: |  |  |  |  |  |  |  |
Financials | $ | 67.4 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | (11.4) |  | $ | 0 |  | $ | 56.0 |
Industrials | 16.4 |  | 0 |  | 0 |  | 0 |  | 0 |  | (0.6) |  | 0 |  | 15.8 |
Common equities: |  |  |  |  |  |  |  |
Common stocks | 18.3 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 18.3 |
Other risk investments | 19.8 |  | 2.1 |  | 0 |  | 0 |  | 0 |  | 0 |  | 0 |  | 21.9 |
Total Level 3 securities | $ | 121.9 |  | $ | 2.1 |  | $ | 0 |  | $ | 0 |  | $ | 0 |  | $ | (12.0) |  | $ | 0 |  | $ | 112.0 |
1 For fixed maturities, amounts included are unrealized gains (losses) included in accumulated other comprehensive income (loss) on our consolidated balance sheets. For equity securities, amounts included are net holding period gains (losses) on securities on our consolidated statements of comprehensive income.
Fair Value Measurement Inputs and Valuation Techniques | The following tables provide a summary of the quantitative information about Level 3 fair value measurements for our applicable securities at June 30, 2024 and 2023, and December 31, 2023:
| Quantitative Information about Level 3 Fair Value Measurements
($ in millions) | Fair Value at June 30, 2024 | Valuation Technique | Unobservable Input | Range of Input Values Increase (Decrease) | Weighted Average Increase (Decrease)
Fixed maturities: |  |  |  |  |
Corporate debt securities | $ | 3.0 |  | Market comparables | Weighted average market capitalization price change % | (1.2)% to 1.2% | 0.2 | %
Equity securities: |  |  |  |  |
Nonredeemable preferred stocks | 51.9 |  | Market comparables | Weighted average market capitalization price change % | (7.6)% to (1.5)% | (2.9) | %
Common stocks | 22.5 |  | Market comparables | Weighted average market capitalization price change % | (26.5)% to 19.3% | (4.4) | %
Subtotal Level 3 securities | 77.4 |  |  |  |  |
Pricing exemption securities | 23.9 |  |  |  |  |
Total Level 3 securities | $ | 101.3 |  |  |  |  |
| Quantitative Information about Level 3 Fair Value Measurements
($ in millions) | Fair Value at June 30, 2023 | Valuation Technique | Unobservable Input | Range of Input Values Increase (Decrease) | Weighted Average Increase (Decrease)
Equity securities: |  |  |  |  |
Nonredeemable preferred stocks | $ | 71.8 |  | Market comparables | Weighted average market capitalization price change % | (6.1)% to 27.6% | 4.4 | %
Common stocks | 18.3 |  | Market comparables | Weighted average market capitalization price change % | (22.0)% to 125.4% | 18.0 | %
Subtotal Level 3 securities | 90.1 |  |  |  |  |
Pricing exemption securities | 21.9 |  |  |  |  |
Total Level 3 securities | $ | 112.0 |  |  |  |  |
| Quantitative Information about Level 3 Fair Value Measurements |
($ in millions) | Fair Value at December 31, 2023 | Valuation Technique | Unobservable Input | Range of Input Values Increase (Decrease) | Weighted Average Increase (Decrease)
Fixed maturities: |  |  |  |  |
Corporate debt securities | $ | 3.0 |  | Market comparables | Weighted average market capitalization price change % | 0.3% to 7.7% | 2.6 | %
Equity securities: |  |  |  |  |
Nonredeemable preferred stocks | 64.0 |  | Market comparables | Weighted average market capitalization price change % | 17.2% to 39.7% | 21.7 | %
Common stocks | 22.5 |  | Market comparables | Weighted average market capitalization price change % | (45.8)% to 95.6% | 39.7 | %
Subtotal Level 3 securities | 89.5 |  |  |  |  |
Pricing exemption securities | 20.6 |  |  |  |  |
Total Level 3 securities | $ | 110.1 |  |  |  |  |

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- Definition Tabular disclosure of assets, including [financial] instruments measured at fair value that are classified in stockholders' equity, if any, by class that are measured at fair value on a recurring basis. The disclosures contemplated herein include the fair value measurements at the reporting date by the level within the fair value hierarchy in which the fair value measurements in their entirety fall, segregating fair value measurements using quoted prices in active markets for identical assets (Level 1), significant other observable inputs (Level 2), and significant unobservable inputs (Level 3). + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (a) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- Definition Tabular disclosure of the fair value measurement of assets using significant unobservable inputs (Level 3), a reconciliation of the beginning and ending balances, separately presenting changes during the period attributable to the following: (1) total gains or losses for the period (realized and unrealized), segregating those gains or losses included in earnings (or changes in net assets) and gains or losses recognized in other comprehensive income (loss), and a description of where those gains or losses included in earnings (or changes in net assets) are reported in the statement of income (or activities); (2) purchases, sales, issues, and settlements (each type disclosed separately); and (3) transfers in and transfers out of Level 3 (for example, transfers due to changes in the observability of significant inputs), by class of asset. + References Reference 1: http://www.xbrl.org/2003/role/exampleRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 55 -Paragraph 101 -Publisher FASB -URI https://asc.fasb.org/1943274/2147482078/820-10-55-101 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 3 -Subparagraph (b) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-3 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (d) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 Reference 4: http://www.xbrl.org/2003/role/disclosureRef -Topic 820 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 2 -Subparagraph (c) -Publisher FASB -URI https://asc.fasb.org/1943274/2147482106/820-10-50-2 + Details
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- References No definition available. + Details
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Namespace Prefix: | us-gaap_
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