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Accumulated Other Comprehensive Income (Loss) ("AOCI") (Tables) | 12 Months Ended
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Dec. 31, 2024
Accumulated Other Comprehensive Income Other Comprehensive Income [Abstract] |
Components of Accumulated Other Comprehensive Income (Loss) | The following table presents a summary of the changes in each component of AOCI for the years ended December 31, 2024, 2023 and 2022:
(in millions) |  | Unrealized gains (losses) on debt securities |  |  | Foreign currency translation adjustment |  |  | Pension benefit adjustment |  |  | Accumulated other comprehensive income (loss) |
Balance at December 31, 2021 |  | $ | 29.3 |  |  | $ | (39.9 | ) |  | $ | (81.8 | ) |  | $ | (92.4 | )
Change in unrealized gains (losses) on debt securities |  |  | (1,044.9 | ) |  |  | — |  |  |  | — |  |  |  | (1,044.9 | )
Change in foreign currency translation adjustment |  |  | — |  |  |  | (43.3 | ) |  |  | — |  |  |  | (43.3 | )
Net actuarial gain |  |  | — |  |  |  | — |  |  |  | 57.4 |  |  |  | 57.4 |
Amortization of net actuarial loss |  |  | — |  |  |  | — |  |  |  | 5.8 |  |  |  | 5.8 |
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | 0.2 |  |  |  | 0.2 |
Tax effect |  |  | 264.0 |  |  |  | 1.1 |  |  |  | (16.8 | ) |  |  | 248.3 |
Balance at December 31, 2022 |  |  | (751.6 | ) |  |  | (82.1 | ) |  |  | (35.2 | ) |  |  | (868.9 | )
Change in unrealized gains (losses) on debt securities |  |  | 262.3 |  |  |  | — |  |  |  | — |  |  |  | 262.3 |
Change in foreign currency translation adjustment |  |  | — |  |  |  | 17.7 |  |  |  | — |  |  |  | 17.7 |
Net actuarial loss |  |  | — |  |  |  | — |  |  |  | (4.8 | ) |  |  | (4.8 | )
Amortization of net actuarial loss |  |  | — |  |  |  | — |  |  |  | 2.0 |  |  |  | 2.0 |
Tax effect |  |  | (64.3 | ) |  |  | (0.5 | ) |  |  | 0.7 |  |  |  | (64.1 | )
Balance at December 31, 2023 |  |  | (553.6 | ) |  |  | (64.9 | ) |  |  | (37.3 | ) |  |  | (655.8 | )
Change in unrealized gains (losses) on debt securities |  |  | 272.7 |  |  |  | — |  |  |  | — |  |  |  | 272.7 |
Change in foreign currency translation adjustment |  |  | — |  |  |  | (47.1 | ) |  |  | — |  |  |  | (47.1 | )
Net actuarial gain |  |  | — |  |  |  | — |  |  |  | 5.3 |  |  |  | 5.3 |
Amortization of net actuarial loss |  |  | — |  |  |  | — |  |  |  | 2.3 |  |  |  | 2.3 |
Tax effect |  |  | (72.8 | ) |  |  | 1.0 |  |  |  | (2.0 | ) |  |  | (73.8 | )
Balance at December 31, 2024 |  | $ | (353.7 | ) |  | $ | (111.0 | ) |  | $ | (31.7 | ) |  | $ | (496.4 | )
Adjustments for Reclassification of Other Comprehensive Income (Loss) | The following table presents the other comprehensive income (loss) reclassification adjustments for the years ended December 31, 2024, 2023 and 2022:
|  | Unrealized gains (losses) on debt securities |  |  | Foreign currency translation adjustment |  |  | Pension benefit adjustment |  |  | Total other comprehensive income (loss) |
|  | (in millions) |
Year ended December 31, 2024 |  |  |  |  |  |  |  |  |  |  |  |
Pretax change before reclassifications |  | $ | (62.4 | ) |  | $ | (47.1 | ) |  | $ | 5.3 |  |  | $ | (104.2 | )
Reclassifications out of AOCI |  |  | 335.1 |  |  |  | — |  |  |  | 2.3 |  |  |  | 337.4 |
Tax effect |  |  | (72.8 | ) |  |  | 1.0 |  |  |  | (2.0 | ) |  |  | (73.8 | )
Total other comprehensive income (loss), net of tax |  | $ | 199.9 |  |  | $ | (46.1 | ) |  | $ | 5.6 |  |  | $ | 159.4 |
Year ended December 31, 2023 |  |  |  |  |  |  |  |  |  |  |  |
Pretax change before reclassifications |  | $ | 181.4 |  |  | $ | 17.7 |  |  | $ | (4.8 | ) |  | $ | 194.3 |
Reclassifications out of AOCI |  |  | 80.9 |  |  |  | — |  |  |  | 2.0 |  |  |  | 82.9 |
Tax effect |  |  | (64.3 | ) |  |  | (0.5 | ) |  |  | 0.7 |  |  |  | (64.1 | )
Total other comprehensive income (loss), net of tax |  | $ | 198.0 |  |  | $ | 17.2 |  |  | $ | (2.1 | ) |  | $ | 213.1 |
Year ended December 31, 2022 |  |  |  |  |  |  |  |  |  |  |  |
Pretax change before reclassifications |  | $ | (1,181.4 | ) |  | $ | (43.3 | ) |  | $ | 57.4 |  |  | $ | (1,167.3 | )
Reclassifications out of AOCI |  |  | 136.5 |  |  |  | — |  |  |  | 6.0 |  |  |  | 142.5 |
Tax effect |  |  | 264.0 |  |  |  | 1.1 |  |  |  | (16.8 | ) |  |  | 248.3 |
Total other comprehensive income (loss), net of tax |  | $ | (780.9 | ) |  | $ | (42.2 | ) |  | $ | 46.6 |  |  | $ | (776.5 | )
Reclassifications out of Accumulated Other Comprehensive Income (Loss) | The following table presents the effects of the reclassifications out of AOCI on the respective line items in the consolidated statements of income:
|  | Year ended December 31, |  |  |
(in millions) |  | 2024 |  |  | 2023 |  |  | 2022 |  |  | Affected line items
Unrealized gains (losses) on debt securities: |  |  |  |  |  |  |  |  |  |  |
Net realized losses on sales of debt securities |  | $ | (335.1 | ) |  | $ | (80.9 | ) |  | $ | (136.5 | ) |  | Net investment losses
Tax effect |  | $ | 89.5 |  |  | $ | 19.8 |  |  | $ | 36.2 |  |  |
Pension benefit adjustment (1): |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  | $ | (2.3 | ) |  | $ | (2.0 | ) |  | $ | (5.8 | ) |  | Other operating expenses
Amortization of prior service cost |  |  | — |  |  |  | — |  |  |  | (0.2 | ) |  | Other operating expenses
Pretax total |  | $ | (2.3 | ) |  | $ | (2.0 | ) |  | $ | (6.0 | ) |  |
Tax effect |  | $ | 0.6 |  |  | $ | 0.5 |  |  | $ | 1.6 |  |  |
(1) Amounts are components of net periodic cost. See Note 16 Employee Benefit Plans for additional details.

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