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Accumulated Other Comprehensive Income (Loss) ("AOCI") | 12 Months Ended
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Dec. 31, 2023
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Accumulated Other Comprehensive Income (Loss) ("AOCI") | NOTE 20. Accumulated Other Comprehensive Income (Loss) (“AOCI”): The following table presents a summary of the changes in each component of AOCI for the years ended December 31, 2023, 2022 and 2021:
(in millions) |  | Unrealized gains (losses) on debt securities |  |  | Foreign currency translation adjustment |  |  | Pension benefit adjustment |  |  | Accumulated other comprehensive income (loss) |
Balance at December 31, 2020 |  | $ | 171.8 |  |  | $ | (38.0 | ) |  | $ | (94.2 | ) |  | $ | 39.6 |
Change in unrealized gains (losses) on debt securities |  |  | (188.6 | ) |  |  | — |  |  |  | — |  |  |  | (188.6 | )
Change in unrealized gains (losses) on debt securities for which credit-related portion was recognized in earnings |  |  | (0.4 | ) |  |  | — |  |  |  | — |  |  |  | (0.4 | )
Change in foreign currency translation adjustment |  |  | — |  |  |  | (1.9 | ) |  |  | — |  |  |  | (1.9 | )
Net actuarial gain |  |  | — |  |  |  | — |  |  |  | 11.4 |  |  |  | 11.4 |
Amortization of net actuarial loss |  |  | — |  |  |  | — |  |  |  | 6.8 |  |  |  | 6.8 |
Amortization of prior service credit |  |  | — |  |  |  | — |  |  |  | (1.3 | ) |  |  | (1.3 | )
Tax effect |  |  | 46.5 |  |  |  | — |  |  |  | (4.5 | ) |  |  | 42.0 |
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 | )
The following table presents the other comprehensive income (loss) reclassification adjustments for the years ended December 31, 2023, 2022 and 2021:
|  | Unrealized gains (losses) on debt securities |  |  | Foreign currency translation adjustment |  |  | Pension benefit adjustment |  |  | Total other comprehensive income (loss) |
|  | (in millions) |
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 | )
Year ended December 31, 2021 |  |  |  |  |  |  |  |  |  |  |  |
Pretax change before reclassifications |  | $ | (168.8 | ) |  | $ | (1.9 | ) |  | $ | 11.4 |  |  | $ | (159.3 | )
Reclassifications out of AOCI |  |  | (20.2 | ) |  |  | — |  |  |  | 5.5 |  |  |  | (14.7 | )
Tax effect |  |  | 46.5 |  |  |  | — |  |  |  | (4.5 | ) |  |  | 42.0 |
Total other comprehensive income (loss), net of tax |  | $ | (142.5 | ) |  | $ | (1.9 | ) |  | $ | 12.4 |  |  | $ | (132.0 | )
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) |  | 2023 |  |  | 2022 |  |  | 2021 |  |  | Affected line items
Unrealized gains (losses) on debt securities: |  |  |  |  |  |  |  |  |  |  |
Net realized (losses) gains on sales of debt securities |  | $ | (80.9 | ) |  | $ | (136.5 | ) |  | $ | 20.3 |  |  | Net investment (losses) gains
Credit losses recognized on debt securities |  |  | — |  |  |  | — |  |  |  | (0.1 | ) |  | Net investment (losses) gains
Pretax total |  | $ | (80.9 | ) |  | $ | (136.5 | ) |  | $ | 20.2 |  |  |
Tax effect |  | $ | 19.8 |  |  | $ | 36.2 |  |  | $ | (5.0 | ) |  |
Pension benefit adjustment (1): |  |  |  |  |  |  |  |  |  |  |
Amortization of net actuarial loss |  | $ | (2.0 | ) |  | $ | (5.8 | ) |  | $ | (6.8 | ) |  | Other operating expenses
Amortization of prior service (cost) credit |  |  | — |  |  |  | (0.2 | ) |  |  | 1.3 |  |  | Other operating expenses
Pretax total |  | $ | (2.0 | ) |  | $ | (6.0 | ) |  | $ | (5.5 | ) |  |
Tax effect |  | $ | 0.5 |  |  | $ | 1.6 |  |  | $ | 1.5 |  |  |
(1) Amounts are components of net periodic cost. See Note 16 Employee Benefit Plans for additional details.

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- Definition The entire disclosure for comprehensive income, which includes, but is not limited to, 1) the amount of income tax expense or benefit allocated to each component of other comprehensive income, including reclassification adjustments, 2) the reclassification adjustments for each classification of other comprehensive income and 3) the ending accumulated balances for each component of comprehensive income. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Topic 944 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-04(19)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483586/944-220-S99-1 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Topic 220 -SubTopic 10 -Name Accounting Standards Codification -Section S99 -Paragraph 2 -Subparagraph (SX 210.5-03(21)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483621/220-10-S99-2 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Topic 942 -SubTopic 220 -Name Accounting Standards Codification -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-04(23)) -Publisher FASB -URI https://asc.fasb.org//1943274/2147483589/942-220-S99-1 Reference 4: http://fasb.org/us-gaap/role/ref/legacyRef -Topic 220 -Name Accounting Standards Codification -Publisher FASB -URI https://asc.fasb.org//220/tableOfContent + Details
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