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v3.24.2.u1

Segment Information - Operating Results (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 18,134.3 | $ 15,353.5 | $ 35,376.8 | $ 29,656.7
Pretax Profit (Loss) | 1,860.4 | 435.7 | 4,800.3 | 990.1
Personal Lines | Agency | Underwriting operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 6,213.4 | 5,207.2 | 12,071.1 | 10,067.4
Pretax Profit (Loss) | 788.5 | (71.2) | 1,739.2 | 91.4
Personal Lines | Direct | Underwriting operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 7,595.5 | 6,180.7 | 14,616.0 | 11,898.1
Pretax Profit (Loss) | 782.7 | 126.5 | 1,826.3 | 104.4
Operating Segments | Underwriting operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 17,209.5 | 14,464.4 | 33,358.1 | 27,997.5
Pretax Profit (Loss) | 1,386.6 | (64.3) | 3,636.5 | 77.3
Operating Segments | Personal Lines | Underwriting operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 13,808.9 | 11,387.9 | 26,687.1 | 21,965.5
Pretax Profit (Loss) | $ 1,571.2 | $ 55.3 | $ 3,565.5 | $ 195.8
Personal auto insurance percentage of the total personal lines segment net premiums earned | 95.00% | 94.00% | 95.00% | 94.00%
Operating Segments | Commercial Lines | Underwriting operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | $ 2,664.5 | $ 2,454.1 | $ 5,221.9 | $ 4,810.2
Pretax Profit (Loss) | 303.8 | 87.2 | 512.8 | 124.4
Operating Segments | Property | Underwriting operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 735.9 | 622.3 | 1,448.7 | 1,221.0
Pretax Profit (Loss) | (487.8) | (206.8) | (440.9) | (239.5)
Operating Segments | Other Indemnity | Underwriting operations |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 0.2 | 0.1 | 0.4 | 0.8
Pretax Profit (Loss) | (0.6) | 0.0 | (0.9) | (3.4)
Segment Reconciling Items |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Interest expense | (69.6) | (65.7) | (139.2) | (129.0)
Segment Reconciling Items | Fees and other revenues |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 259.8 | 226.7 | 496.3 | 432.9
Segment Reconciling Items | Service businesses |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 106.3 | 81.0 | 190.5 | 153.5
Pretax Profit (Loss) | (8.0) | (9.6) | (15.9) | (19.4)
Segment Reconciling Items | Investments |  |  |  |
Segment Reporting Information [Line Items] |  |  |  |
Revenues | 558.7 | 581.4 | 1,331.9 | 1,072.8
Pretax Profit (Loss) | $ 551.4 | $ 575.3 | $ 1,318.9 | $ 1,061.2

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