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Other Comprehensive Income (Loss) - Components of Other Comprehensive Income (Loss) Including Reclassification Adjustments by Income Statement (Detail) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2024 | Jun. 30, 2023 | Jun. 30, 2024 | Jun. 30, 2023
Accumulated Other Comprehensive Income (Loss), before Tax [Roll Forward] |  |  |  |
Pretax total accumulated other comprehensive income (loss), beginning balance | $ (2,316.2) | $ (2,793.3) | $ (2,052.9) | $ (3,556.9)
Pretax total accumulated other comprehensive income (loss), Investment securities | (85.1) | (651.5) | (498.7) | 54.1
Pretax total accumulated other comprehensive income (loss), Foreign currency translation adjustment |  | 0.3 | (0.3) | 0.3
Pretax total accumulated other comprehensive income (loss), before reclassifications | (85.1) | (651.2) | (499.0) | 54.4
Pretax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | (221.5) | (74.8) | (372.0) | (132.7)
Pretax total accumulated other comprehensive income (loss), Interest expense | (0.2) | (0.1) | (0.3) | (0.2)
Total reclassification adjustment for amounts realized in net income, pre tax | (221.7) | (74.9) | (372.3) | (132.9)
Total other comprehensive income (loss), pre tax | 136.6 | (576.3) | (126.7) | 187.3
Pretax total accumulated other comprehensive income (loss), ending balance | (2,179.6) | (3,369.6) | (2,179.6) | (3,369.6)
Accumulated Other Comprehensive Income (Loss), Tax [Roll Forward] |  |  |  |
Total tax (provision) benefit, beginning balance | 492.6 | 594.6 | 437.2 | 754.9
Total tax (provision) benefit, Investment securities | 18.0 | 136.8 | 104.9 | (11.4)
Total tax (provision) benefit, Foreign currency translation adjustment |  | (0.1) | 0.1 | (0.1)
Total tax (provision) benefit, before reclassifications | 18.0 | 136.7 | 105.0 | (11.5)
Total tax (provision) benefit, Net realized gains (losses) on securities | 46.7 | 15.7 | 78.3 | 27.8
Total tax (provision) benefit, Interest expense | 0.1 | 0.0 | 0.1 | 0.0
Total reclassification adjustment for amounts realized in net income, Total tax (provision) benefit | 46.8 | 15.7 | 78.4 | 27.8
Total other comprehensive income (loss), tax (provision) benefit | (28.8) | 121.0 | 26.6 | (39.3)
Total tax (provision) benefit, ending balance | 463.8 | 715.6 | 463.8 | 715.6
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income (loss), beginning balance | (1,823.6) | (2,198.7) | (1,615.7) | (2,802.0)
After tax total accumulated other comprehensive income (loss), Investment securities | (67.1) | (514.7) | (393.8) | 42.7
After tax total accumulated other comprehensive income (loss), Foreign currency translation adjustment | 0.0 | 0.2 | (0.2) | 0.2
After tax total accumulated other comprehensive income (loss), before reclassifications | (67.1) | (514.5) | (394.0) | 42.9
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | (174.8) | (59.1) | (293.7) | (104.9)
After tax total accumulated other comprehensive income (loss), Interest expense | (0.1) | (0.1) | (0.2) | (0.2)
Total reclassification adjustment for amounts realized in net income, after tax | (174.9) | (59.2) | (293.9) | (105.1)
Total other comprehensive income (loss), after tax | 107.8 | (455.3) | (100.1) | 148.0
After tax total accumulated other comprehensive income (loss), ending balance | (1,715.8) | (2,654.0) | (1,715.8) | (2,654.0)
Total net unrealized gains (losses) on securities |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income (loss), beginning balance | (1,808.6) | (2,183.1) | (1,600.8) | (2,786.3)
After tax total accumulated other comprehensive income (loss), Investment securities | (67.1) | (514.7) | (393.8) | 42.7
After tax total accumulated other comprehensive income (loss), Foreign currency translation adjustment |  | 0.0 | 0.0 | 0.0
After tax total accumulated other comprehensive income (loss), before reclassifications | (67.1) | (514.7) | (393.8) | 42.7
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | (174.8) | (59.1) | (293.7) | (104.9)
After tax total accumulated other comprehensive income (loss), Interest expense | 0.0 | 0.0 | 0.0 | 0.0
Total reclassification adjustment for amounts realized in net income, after tax | (174.8) | (59.1) | (293.7) | (104.9)
Total other comprehensive income (loss), after tax | 107.7 | (455.6) | (100.1) | 147.6
After tax total accumulated other comprehensive income (loss), ending balance | (1,700.9) | (2,638.7) | (1,700.9) | (2,638.7)
Net unrealized losses on forecasted transactions |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income (loss), beginning balance | (13.9) | (14.4) | (14.0) | (14.5)
After tax total accumulated other comprehensive income (loss), Investment securities | 0.0 | 0.0 | 0.0 | 0.0
After tax total accumulated other comprehensive income (loss), Foreign currency translation adjustment |  | 0.0 | 0.0 | 0.0
After tax total accumulated other comprehensive income (loss), before reclassifications | 0.0 | 0.0 | 0.0 | 0.0
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | 0.0 | 0.0 | 0.0 | 0.0
After tax total accumulated other comprehensive income (loss), Interest expense | (0.1) | (0.1) | (0.2) | (0.2)
Total reclassification adjustment for amounts realized in net income, after tax | (0.1) | (0.1) | (0.2) | (0.2)
Total other comprehensive income (loss), after tax | 0.1 | 0.1 | 0.2 | 0.2
After tax total accumulated other comprehensive income (loss), ending balance | (13.8) | (14.3) | (13.8) | (14.3)
Foreign currency translation adjustment |  |  |  |
Accumulated Other Comprehensive Income (Loss), Net of Tax [Roll Forward] |  |  |  |
After tax total accumulated other comprehensive income (loss), beginning balance | (1.1) | (1.2) | (0.9) | (1.2)
After tax total accumulated other comprehensive income (loss), Investment securities | 0.0 | 0.0 | 0.0 | 0.0
After tax total accumulated other comprehensive income (loss), Foreign currency translation adjustment |  | 0.2 | (0.2) | 0.2
After tax total accumulated other comprehensive income (loss), before reclassifications | 0.0 | 0.2 | (0.2) | 0.2
After tax total accumulated other comprehensive income (loss), Net realized gains (losses) on securities | 0.0 | 0.0 | 0.0 | 0.0
After tax total accumulated other comprehensive income (loss), Interest expense | 0.0 | 0.0 | 0.0 | 0.0
Total reclassification adjustment for amounts realized in net income, after tax | 0.0 | 0.0 | 0.0 | 0.0
Total other comprehensive income (loss), after tax | 0.0 | 0.2 | (0.2) | 0.2
After tax total accumulated other comprehensive income (loss), ending balance | $ (1.1) | $ (1.0) | $ (1.1) | $ (1.0)

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