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Other Comprehensive Income (Loss) (Tables) | 9 Months Ended
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Sep. 30, 2023
Equity [Abstract] |
Components of Other Comprehensive Income (Loss) | The components of other comprehensive income (loss), including reclassification adjustments by income statement line item, were as follows:
|  |  |  |  |  |  | Components of Changes in Accumulated Other Comprehensive Income (after tax) |  |  |  |  |  |  |  |  |  |  |  |  |
(millions) | Pretax total accumulated other comprehensive income (loss) |  | Total tax (provision) benefit |  | After tax total accumulated other comprehensive income (loss) |  | Total net unrealized gains (losses) on securities |  | Net unrealized losses on forecasted transactions |  | Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at June 30, 2023 | $ | (3,369.6) |  |  | $ | 715.6 |  |  | $ | (2,654.0) |  |  | $ | (2,638.7) |  |  | $ | (14.3) |  |  | $ | (1.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities | (547.4) |  |  | 114.9 |  |  | (432.5) |  |  | (432.5) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) before reclassifications | (547.4) |  |  | 114.9 |  |  | (432.5) |  |  | (432.5) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Reclassification adjustment for amounts realized in net income by income statement line item: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on securities | (55.6) |  |  | 11.7 |  |  | (43.9) |  |  | (43.9) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | (0.2) |  |  | 0 |  |  | (0.2) |  |  | 0 |  |  | (0.2) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total reclassification adjustment for amounts realized in net income | (55.8) |  |  | 11.7 |  |  | (44.1) |  |  | (43.9) |  |  | (0.2) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) | (491.6) |  |  | 103.2 |  |  | (388.4) |  |  | (388.6) |  |  | 0.2 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at September 30, 2023 | $ | (3,861.2) |  |  | $ | 818.8 |  |  | $ | (3,042.4) |  |  | $ | (3,027.3) |  |  | $ | (14.1) |  |  | $ | (1.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  | Components of Changes in Accumulated Other Comprehensive Income (after tax) |  |  |  |  |  |  |  |  |  |  |  |  |
(millions) | Pretax total accumulated other comprehensive income (loss) |  | Total tax (provision) benefit |  | After tax total accumulated other comprehensive income (loss) |  | Total net unrealized gains (losses) on securities |  | Net unrealized losses on forecasted transactions |  | Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at June 30, 2022 | $ | (2,795.5) |  |  | $ | 586.5 |  |  | $ | (2,209.0) |  |  | $ | (2,193.5) |  |  | $ | (14.7) |  |  | $ | (0.8) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities | (1,223.3) |  |  | 256.9 |  |  | (966.4) |  |  | (966.4) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (0.9) |  |  | 0.2 |  |  | (0.7) |  |  | 0 |  |  | 0 |  |  | (0.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) before reclassifications | (1,224.2) |  |  | 257.1 |  |  | (967.1) |  |  | (966.4) |  |  | 0 |  |  | (0.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Reclassification adjustment for amounts realized in net income by income statement line item: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on securities | (58.4) |  |  | 12.3 |  |  | (46.1) |  |  | (46.1) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | (0.2) |  |  | 0.1 |  |  | (0.1) |  |  | 0 |  |  | (0.1) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total reclassification adjustment for amounts realized in net income | (58.6) |  |  | 12.4 |  |  | (46.2) |  |  | (46.1) |  |  | (0.1) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) | (1,165.6) |  |  | 244.7 |  |  | (920.9) |  |  | (920.3) |  |  | 0.1 |  |  | (0.7) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at September 30, 2022 | $ | (3,961.1) |  |  | $ | 831.2 |  |  | $ | (3,129.9) |  |  | $ | (3,113.8) |  |  | $ | (14.6) |  |  | $ | (1.5) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  | Components of Changes in Accumulated Other Comprehensive Income (after tax) |  |  |  |  |  |  |  |  |  |  |  |  |
(millions) | Pretax total accumulated other comprehensive income (loss) |  | Total tax (provision) benefit |  | After tax total accumulated other comprehensive income (loss) |  | Total net unrealized gains (losses) on securities |  | Net unrealized losses on forecasted transactions |  | Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2022 | $ | (3,556.9) |  |  | $ | 754.9 |  |  | $ | (2,802.0) |  |  | $ | (2,786.3) |  |  | $ | (14.5) |  |  | $ | (1.2) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities | (493.3) |  |  | 103.5 |  |  | (389.8) |  |  | (389.8) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | 0.3 |  |  | (0.1) |  |  | 0.2 |  |  | 0 |  |  | 0 |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) before reclassifications | (493.0) |  |  | 103.4 |  |  | (389.6) |  |  | (389.8) |  |  | 0 |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Reclassification adjustment for amounts realized in net income by income statement line item: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on securities | (188.3) |  |  | 39.5 |  |  | (148.8) |  |  | (148.8) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | (0.4) |  |  | 0 |  |  | (0.4) |  |  | 0 |  |  | (0.4) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total reclassification adjustment for amounts realized in net income | (188.7) |  |  | 39.5 |  |  | (149.2) |  |  | (148.8) |  |  | (0.4) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) | (304.3) |  |  | 63.9 |  |  | (240.4) |  |  | (241.0) |  |  | 0.4 |  |  | 0.2 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at September 30, 2023 | $ | (3,861.2) |  |  | $ | 818.8 |  |  | $ | (3,042.4) |  |  | $ | (3,027.3) |  |  | $ | (14.1) |  |  | $ | (1.0) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
|  |  |  |  |  |  | Components of Changes in Accumulated Other Comprehensive Income (after tax) |  |  |  |  |  |  |  |  |  |  |  |  |
(millions) | Pretax total accumulated other comprehensive income (loss) |  | Total tax (provision) benefit |  | After tax total accumulated other comprehensive income (loss) |  | Total net unrealized gains (losses) on securities |  | Net unrealized losses on forecasted transactions |  | Foreign currency translation adjustment |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at December 31, 2021 | $ | 52.3 |  |  | $ | (11.6) |  |  | $ | 40.7 |  |  | $ | 56.2 |  |  | $ | (14.9) |  |  | $ | (0.6) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Other comprehensive income (loss) before reclassifications: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Investment securities | (4,321.7) |  |  | 907.6 |  |  | (3,414.1) |  |  | (3,414.1) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Foreign currency translation adjustment | (1.1) |  |  | 0.2 |  |  | (0.9) |  |  | 0 |  |  | 0 |  |  | (0.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) before reclassifications | (4,322.8) |  |  | 907.8 |  |  | (3,415.0) |  |  | (3,414.1) |  |  | 0 |  |  | (0.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Less: Reclassification adjustment for amounts realized in net income by income statement line item: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Net realized gains (losses) on securities | (309.0) |  |  | 64.9 |  |  | (244.1) |  |  | (244.1) |  |  | 0 |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Interest expense | (0.4) |  |  | 0.1 |  |  | (0.3) |  |  | 0 |  |  | (0.3) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total reclassification adjustment for amounts realized in net income | (309.4) |  |  | 65.0 |  |  | (244.4) |  |  | (244.1) |  |  | (0.3) |  |  | 0 |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Total other comprehensive income (loss) | (4,013.4) |  |  | 842.8 |  |  | (3,170.6) |  |  | (3,170.0) |  |  | 0.3 |  |  | (0.9) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Balance at September 30, 2022 | $ | (3,961.1) |  |  | $ | 831.2 |  |  | $ | (3,129.9) |  |  | $ | (3,113.8) |  |  | $ | (14.6) |  |  | $ | (1.5) |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |

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