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Securities (Tables)
 9 Months Ended
Sep. 30, 2024
Investments, Debt and Equity Securities [Abstract]  
Reconciliation of Amortized Cost to Fair Value of Securities Available for Sale The following tables provide the amortized cost and fair values as of September 30, 2024 and December 31, 2023, and remaining maturities of AFS debt securities as of September 30, 2024.
TABLE 40: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF AVAILABLE FOR SALE DEBT SECURITIES
SEPTEMBER 30, 2024
(In Millions)AMORTIZED COSTGROSS UNREALIZED GAINSGROSS UNREALIZED LOSSESFAIR VALUE
U.S. Government$6,497.4 $3.4 $19.1 $6,481.7 
Obligations of States and Political Subdivisions321.6 — 15.6 306.0 
Government Sponsored Agency13,749.0 19.0 114.3 13,653.7 
Non-U.S. Government341.5 — 14.4 327.1 
Corporate Debt205.0 0.1 4.0 201.1 
Covered Bonds242.2 0.6 3.1 239.7 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds4,019.7 14.0 45.6 3,988.1 
Other Asset-Backed2,494.5 7.1 14.2 2,487.4 
Commercial Mortgage-Backed642.2 0.1 15.2 627.1 
Total$28,513.1 $44.3 $245.5 $28,311.9 
DECEMBER 31, 2023
(In Millions)AMORTIZED COSTGROSS UNREALIZED GAINSGROSS UNREALIZED LOSSESFAIR VALUE
U.S. Government$3,681.5 $2.2 $61.5 $3,622.2 
Obligations of States and Political Subdivisions315.8 — 20.0 295.8 
Government Sponsored Agency11,744.3 9.0 200.3 11,553.0 
Non-U.S. Government284.8 — 20.4 264.4 
Corporate Debt287.5 0.1 8.1 279.5 
Covered Bonds356.8 — 9.7 347.1 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds3,013.8 0.1 114.0 2,899.9 
Other Asset-Backed3,061.0 1.6 100.0 2,962.6 
Commercial Mortgage-Backed913.5 0.2 48.4 865.3 
Total$23,659.0 $13.2 $582.4 $23,089.8 
Remaining Maturity of Securities Available for Sale and Held to Maturity
TABLE 41: REMAINING MATURITY OF AVAILABLE FOR SALE DEBT SECURITIES
SEPTEMBER 30, 2024ONE YEAR OR LESSONE TO FIVE YEARSFIVE TO TEN YEARSOVER TEN YEARSTOTAL
(In Millions)AMORTIZED COSTFAIR VALUEAMORTIZED COSTFAIR VALUEAMORTIZED COSTFAIR VALUEAMORTIZED COSTFAIR VALUEAMORTIZED COSTFAIR VALUE
U.S. Government$496.2 $493.9 $3,862.0 $3,852.1 $2,139.2 $2,135.7 $— $— $6,497.4 $6,481.7 
Obligations of States and Political Subdivisions— — 206.3 198.0 115.3 108.0 — — 321.6 306.0 
Government Sponsored Agency3,223.6 3,209.3 7,181.0 7,141.1 2,472.3 2,449.7 872.1 853.6 13,749.0 13,653.7 
Non-U.S. Government69.2 68.8 272.3 258.3 — — — — 341.5 327.1 
Corporate Debt114.6 114.1 90.4 87.0 — — — — 205.0 201.1 
Covered Bonds— — 242.2 239.7 — — — — 242.2 239.7 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds192.8 190.9 3,520.1 3,501.1 306.8 296.1 — — 4,019.7 3,988.1 
Other Asset-Backed154.6 152.6 1,726.6 1,719.6 496.6 498.2 116.7 117.0 2,494.5 2,487.4 
Commercial Mortgage-Backed23.1 22.8 585.0 576.2 34.1 28.1 — — 642.2 627.1 
Total$4,274.1 $4,252.4 $17,685.9 $17,573.1 $5,564.3 $5,515.8 $988.8 $970.6 $28,513.1 $28,311.9 
Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments.
TABLE 44: REMAINING MATURITY OF HELD TO MATURITY DEBT SECURITIES
SEPTEMBER 30, 2024ONE YEAR OR LESSONE TO FIVE YEARSFIVE TO TEN YEARSOVER TEN YEARSTOTAL
(In Millions)Amortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair ValueAmortized CostFair Value
Obligations of States and Political Subdivisions$106.8 $106.3 $1,302.2 $1,298.7 $935.6 $931.9 $205.3 $202.6 $2,549.9 $2,539.5 
Government Sponsored Agency917.4 843.7 3,345.6 3,056.6 2,874.6 2,617.6 1,689.2 1,487.7 8,826.8 8,005.6 
Non-U.S. Government1,254.9 1,252.6 1,072.4 1,013.1 34.0 30.6 — — 2,361.3 2,296.3 
Corporate Debt249.3 245.5 226.1 217.2 15.7 13.7 — — 491.1 476.4 
Covered Bonds660.6 656.9 1,254.4 1,200.5 209.8 195.0 — — 2,124.8 2,052.4 
Certificates of Deposit542.6 542.3 — — — — — — 542.6 542.3 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds1,723.9 1,705.6 3,332.5 3,156.7 5.7 4.8 — — 5,062.1 4,867.1 
Other Asset-Backed4.7 4.5 69.2 69.7 37.7 37.7 — — 111.6 111.9 
Commercial Mortgage-Backed— — 37.6 36.6 — — — — 37.6 36.6 
Other71.0 69.3 293.3 267.6 50.7 42.5 185.8 64.5 600.8 443.9 
Total$5,531.2 $5,426.7 $10,933.3 $10,316.7 $4,163.8 $3,873.8 $2,080.3 $1,754.8 $22,708.6 $21,372.0 
Note: Mortgage-backed and asset-backed securities are included in the above table taking into account anticipated future prepayments
Debt Securities, Available-for-sale, Unrealized Loss Position, Fair Value The following table provides information regarding AFS debt securities with no credit losses reported that had been in a continuous unrealized loss position for less than twelve months and for twelve months or longer as of September 30, 2024 and December 31, 2023.
TABLE 42: AVAILABLE FOR SALE DEBT SECURITIES IN UNREALIZED LOSS POSITION WITH NO CREDIT LOSSES REPORTED
SEPTEMBER 30, 2024LESS THAN 12 MONTHS12 MONTHS OR LONGERTOTAL
(In Millions)FAIR
VALUE		UNREALIZED
LOSSES		FAIR
VALUE		UNREALIZED
LOSSES		FAIR
VALUE		UNREALIZED
LOSSES
U.S. Government$5,293.0 $6.9 $630.9 $12.2 $5,923.9 $19.1 
Obligations of States and Political Subdivisions— — 305.9 15.6 305.9 15.6 
Government Sponsored Agency2,028.2 3.6 6,676.9 110.7 8,705.1 114.3 
Non-U.S. Government 55.3 — 271.9 14.4 327.2 14.4 
Corporate Debt— — 104.5 2.4 104.5 2.4 
Covered Bonds— — 126.7 3.1 126.7 3.1 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds645.3 0.7 917.6 44.9 1,562.9 45.6 
Other Asset-Backed— — 476.3 14.2 476.3 14.2 
Commercial Mortgage-Backed12.5 — 587.8 15.2 600.3 15.2 
Total$8,034.3 $11.2 $10,098.5 $232.7 $18,132.8 $243.9 
Note: One corporate debt AFS security with a fair value of $43.1 million and unrealized losses of $1.6 million has been excluded from the table above as this AFS security had a $0.2 million allowance for credit losses reported as of September 30, 2024. Refer to the discussion further below and Note 6—Allowance for Credit Losses for further information.
DECEMBER 31, 2023LESS THAN 12 MONTHS12 MONTHS OR LONGERTOTAL
(In Millions)FAIR
VALUE		UNREALIZED
LOSSES		FAIR
VALUE		UNREALIZED
LOSSES		FAIR
VALUE		UNREALIZED
LOSSES
U.S. Government$— $— $3,364.7 $61.5 $3,364.7 $61.5 
Obligations of States and Political Subdivisions87.8 5.9 208.0 14.1 295.8 20.0 
Government Sponsored Agency331.0 11.5 9,486.6 188.8 9,817.6 200.3 
Non-U.S. Government— — 264.5 20.4 264.5 20.4 
Corporate Debt4.4 0.1 143.0 2.1 147.4 2.2 
Covered Bonds— — 213.2 9.7 213.2 9.7 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds— — 2,477.0 105.8 2,477.0 105.8 
Other Asset-Backed19.8 2.0 1,998.7 98.0 2,018.5 100.0 
Commercial Mortgage-Backed60.0 4.6 776.6 43.8 836.6 48.4 
Total$503.0 $24.1 $18,932.3 $544.2 $19,435.3 $568.3 
Note: Three corporate debt AFS securities with a fair value of $98.4 million and unrealized losses of $5.9 million and one sub-sovereign, supranational and non-U.S. agency bonds AFS security with a fair value of $71.0 million and unrealized loss of $8.2 million have been excluded from the table above as these AFS securities have a $1.2 million allowance for credit losses reported as of December 31, 2023. Refer to the discussion further below and Note 6—Allowance for Credit Losses for further information.
Debt Securities, Held-to-maturity The following tables provide the amortized cost and fair values as of September 30, 2024 and December 31, 2023, and remaining maturities of HTM debt securities as of September 30, 2024.
TABLE 43: RECONCILIATION OF AMORTIZED COST TO FAIR VALUE OF HELD TO MATURITY DEBT SECURITIES
SEPTEMBER 30, 2024
(In Millions)AMORTIZED
COST		GROSS UNREALIZED GAINSGROSS UNREALIZED LOSSESFAIR
VALUE
Obligations of States and Political Subdivisions$2,549.9 $4.4 $14.8 $2,539.5 
Government Sponsored Agency8,826.8 2.6 823.8 8,005.6 
Non-U.S. Government2,361.3 0.2 65.2 2,296.3 
Corporate Debt491.1 — 14.7 476.4 
Covered Bonds2,124.8 0.3 72.7 2,052.4 
Certificates of Deposit542.6 — 0.3 542.3 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds5,062.1 2.6 197.6 4,867.1 
Other Asset-Backed111.6 0.5 0.2 111.9 
Commercial Mortgage-Backed37.6 — 1.0 36.6 
Other600.8 — 156.9 443.9 
Total$22,708.6 $10.6 $1,347.2 $21,372.0 
DECEMBER 31, 2023
(In Millions)AMORTIZED
COST		GROSS UNREALIZED GAINSGROSS UNREALIZED LOSSES FAIR
VALUE
Obligations of States and Political Subdivisions2,563.9 0.5 72.4 2,492.0 
Government Sponsored Agency9,355.3 2.3 1,012.4 8,345.2 
Non-U.S. Government4,789.1 0.2 90.7 4,698.6 
Corporate Debt646.1 — 28.2 617.9 
Covered Bonds2,208.6 0.3 108.3 2,100.6 
Certificates of Deposit585.1 — 0.7 584.4 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds5,245.5 3.2 294.9 4,953.8 
Other Asset-Backed214.2 0.4 0.2 214.4 
Commercial Mortgage-Backed37.6 — 0.8 36.8 
Other576.3 — 147.0 429.3 
Total$26,221.7 $6.9 $1,755.6 $24,473.0 
Debt Securities, Held-to-maturity, Credit Quality Indicator The following table provides the amortized cost of HTM debt securities by credit rating.
TABLE 45: AMORTIZED COST OF HELD TO MATURITY DEBT SECURITIES BY CREDIT RATING
SEPTEMBER 30, 2024
($ In Millions)AAAAAABBBNOT RATEDTOTAL
Obligations of States and Political Subdivisions$980.8 $1,569.1 $— $— $— $2,549.9 
Government Sponsored Agency8,826.8 — — — — 8,826.8 
Non-U.S. Government456.4 816.2 752.7 336.0 — 2,361.3 
Corporate Debt— 290.4 200.7 — — 491.1 
Covered Bonds2,124.8 — — — — 2,124.8 
Certificates of Deposit513.2 — — — 29.4 542.6 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds3,825.8 1,204.5 30.7 1.1 — 5,062.1 
Other Asset-Backed111.6 — — — — 111.6 
Commercial Mortgage-Backed37.6 — — — — 37.6 
Other54.7 — — — 546.1 600.8 
Total$16,931.7 $3,880.2 $984.1 $337.1 $575.5 $22,708.6 
Percent of Total75 %17 %4 %1 %3 %100 %
DECEMBER 31, 2023
($ In Millions)AAAAAABBBNOT RATEDTOTAL
Obligations of States and Political Subdivisions$954.7 $1,609.0 $— $— $0.2 $2,563.9 
Government Sponsored Agency9,355.3 — — — — 9,355.3 
Non-U.S. Government813.3 1,179.6 2,463.3 332.9 — 4,789.1 
Corporate Debt2.1 302.6 341.4 — — 646.1 
Covered Bonds2,208.6 — — — — 2,208.6 
Certificates of Deposit545.9 — — — 39.2 585.1 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds4,047.9 1,166.5 30.0 1.1 — 5,245.5 
Other Asset-Backed214.2 — — — — 214.2 
Commercial Mortgage-Backed37.6 — — — — 37.6 
Other54.8 — — — 521.5 576.3 
Total$18,234.4 $4,257.7 $2,834.7 $334.0 $560.9 $26,221.7 
Percent of Total70 %16 %11 %1 %2 %100 %
Investment Security Gains and Losses
TABLE 46: INVESTMENT SECURITY GAINS AND LOSSES
THREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2024202320242023
Gross Realized Debt Securities Gains$— $— $185.2 $213.0 
Gross Realized Debt Securities Losses— — (374.5)(206.1)
Investment Security Gains (Losses), net$— $— $(189.3)$6.9 

TABLE 47: INVESTMENT SECURITY GAINS AND LOSSES BY SECURITY TYPE
THREE MONTHS ENDED SEPTEMBER 30,NINE MONTHS ENDED SEPTEMBER 30,
(In Millions)2024202320242023
U.S. Government$— $— $(34.8)$— 
Obligations of States and Political Subdivisions— — — 9.8 
Government Sponsored Agency— — (23.0)— 
Corporate Debt— — — (1.2)
Covered Bonds— — (4.2)— 
Sub-Sovereign, Supranational and Non-U.S. Agency Bonds— — (48.2)— 
Other Asset-Backed— — (56.5)(0.8)
Commercial Mortgage-Backed— — (22.6)(0.9)
Investment Security Gains (Losses), net$— $— $(189.3)$6.9