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Accumulated Other Comprehensive Income (Notes) | 6 Months Ended
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Jun. 30, 2025
Accumulated Other Comprehensive Income (Loss), Net of Tax [Abstract] |
Schedule of Accumulated Other Comprehensive Income (Loss) | Accumulated Other Comprehensive Income (Loss) The following tables present changes in the accumulated balances for each component of other comprehensive income (loss), including current period other comprehensive income (loss) and reclassifications out of accumulated other comprehensive income (loss):
(in millions) | Investment Securities |  | Defined Benefit Plans |  | Derivative Investments |  | Foreign Currency Translation |  | Total
Balance at December 31, 2024 | $ | (0.3) |  |  | $ | (14.1) |  |  | $ | 59.3 |  |  | $ | (150.4) |  |  | $ | (105.5) |
Other comprehensive income (loss) before reclassifications and income tax benefit (expense) | 0.1 |  |  | (1.2) |  |  | — |  |  | 164.3 |  |  | 163.2 |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | (0.1) |  |  | (2.0) |  |  | — |  |  | (2.1) |
Income tax benefit (expense) | — |  |  | 0.3 |  |  | 0.5 |  |  | (11.0) |  |  | (10.2) |
Net current period other comprehensive income (loss) | 0.1 |  |  | (1.0) |  |  | (1.5) |  |  | 153.3 |  |  | 150.9 |
Balance at June 30, 2025 | $ | (0.2) |  |  | $ | (15.1) |  |  | $ | 57.8 |  |  | $ | 2.9 |  |  | $ | 45.4 |
(in millions) | Investment Securities |  | Defined Benefit Plans |  | Derivative Investments |  | Foreign Currency Translation |  | Total
Balance at December 31, 2023 | $ | (0.4) |  |  | $ | (23.4) |  |  | $ | 62.0 |  |  | $ | (93.8) |  |  | $ | (55.6) |
Other comprehensive income (loss) before reclassifications and income tax benefit (expense) | — |  |  | (5.9) |  |  | — |  |  | (33.6) |  |  | (39.5) |
Amounts reclassified from accumulated other comprehensive income (loss) | — |  |  | — |  |  | (1.8) |  |  | — |  |  | (1.8) |
Income tax benefit (expense) | — |  |  | 1.5 |  |  | 0.4 |  |  | — |  |  | 1.9 |
Net current period other comprehensive income (loss) | — |  |  | (4.4) |  |  | (1.4) |  |  | (33.6) |  |  | (39.4) |
Balance at June 30, 2024 | $ | (0.4) |  |  | $ | (27.8) |  |  | $ | 60.6 |  |  | $ | (127.4) |  |  | $ | (95.0) |

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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/1943274/2147477250/944-220-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/1943274/2147478524/942-220-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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