v3.25.2
Loans (Credit Quality Indicator At Amortized Cost By Origination Year) (Details) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended 12 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one $ 5,557.3   $ 5,557.3   $ 6,875.8
Year two 3,328.9   3,328.9   3,905.4
Year three 3,213.0   3,213.0   3,835.4
Year four 3,345.8   3,345.8   3,176.8
Year five 2,423.8   2,423.8   1,540.2
PRIOR 4,010.7   4,010.7   2,664.7
REVOLVING LOANS 20,753.0   20,753.0   20,656.1
REVOLVING LOANS CONVERTED TO TERM LOANS 690.9   690.9   736.2
TOTAL LOANS 43,323.4   43,323.4   43,390.6
Year one, Charge-offs     0.0   0.0
Year two, Charge-offs     0.0   (7.3)
Year three, Charge-offs     0.0   (7.8)
Year four, Charge-offs     (0.1)   0.0
Year five, Charge-offs     0.0   0.0
Prior, Charge-offs     (0.3)   (0.4)
REVOLVING LOANS, Charge-offs     0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs     0.0   0.0
Charge-Offs (0.1) $ (0.3) (0.4) $ (11.4) (15.5)
Commercial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 4,706.8   4,706.8   5,454.6
Year two 2,180.0   2,180.0   2,764.1
Year three 2,460.5   2,460.5   2,261.1
Year four 1,927.6   1,927.6   1,624.2
Year five 1,143.6   1,143.6   428.7
PRIOR 1,152.1   1,152.1   698.9
REVOLVING LOANS 6,390.3   6,390.3   6,948.9
REVOLVING LOANS CONVERTED TO TERM LOANS 124.6   124.6   98.3
TOTAL LOANS 20,085.5   20,085.5   20,278.8
Year one, Charge-offs     0.0   0.0
Year two, Charge-offs     0.0   (7.3)
Year three, Charge-offs     0.0   (7.8)
Year four, Charge-offs     (0.1)   0.0
Year five, Charge-offs     0.0   0.0
Prior, Charge-offs     (0.2)   0.0
REVOLVING LOANS, Charge-offs     0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs     0.0   0.0
Charge-Offs 0.0 0.0 (0.3) (11.0) (15.1)
Commercial | Commercial and Institutional          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 450.2   450.2   1,205.2
Year two 1,217.1   1,217.1   833.9
Year three 744.2   744.2   826.2
Year four 676.2   676.2   964.7
Year five 541.2   541.2   166.8
PRIOR 513.8   513.8   423.7
REVOLVING LOANS 5,645.8   5,645.8   6,023.5
REVOLVING LOANS CONVERTED TO TERM LOANS 105.5   105.5   93.1
TOTAL LOANS 9,894.0   9,894.0   10,537.1
Year one, Charge-offs     0.0   0.0
Year two, Charge-offs     0.0   (7.3)
Year three, Charge-offs     0.0   (5.4)
Year four, Charge-offs     0.0   0.0
Year five, Charge-offs     0.0   0.0
Prior, Charge-offs     (0.2)   0.0
REVOLVING LOANS, Charge-offs     0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs     0.0   0.0
Charge-Offs     (0.2)   (12.7)
Commercial | Commercial and Institutional | 1 to 3 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 144.2   144.2   462.1
Year two 479.8   479.8   238.2
Year three 190.9   190.9   367.9
Year four 292.5   292.5   466.2
Year five 277.8   277.8   82.2
PRIOR 349.7   349.7   277.2
REVOLVING LOANS 4,054.0   4,054.0   4,364.8
REVOLVING LOANS CONVERTED TO TERM LOANS 51.2   51.2   26.5
TOTAL LOANS 5,840.1   5,840.1   6,285.1
Commercial | Commercial and Institutional | 4 to 5 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 281.4   281.4   708.3
Year two 721.5   721.5   506.4
Year three 426.2   426.2   392.5
Year four 326.6   326.6   428.3
Year five 248.2   248.2   82.3
PRIOR 155.7   155.7   144.2
REVOLVING LOANS 1,508.7   1,508.7   1,585.1
REVOLVING LOANS CONVERTED TO TERM LOANS 44.6   44.6   59.7
TOTAL LOANS 3,712.9   3,712.9   3,906.8
Commercial | Commercial and Institutional | 6 to 9 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 24.6   24.6   34.8
Year two 15.8   15.8   89.3
Year three 127.1   127.1   65.8
Year four 57.1   57.1   70.2
Year five 15.2   15.2   2.3
PRIOR 8.4   8.4   2.3
REVOLVING LOANS 83.1   83.1   73.6
REVOLVING LOANS CONVERTED TO TERM LOANS 9.7   9.7   6.9
TOTAL LOANS 341.0   341.0   345.2
Commercial | Commercial Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 327.7   327.7   747.3
Year two 817.5   817.5   1,846.3
Year three 1,658.0   1,658.0   1,420.5
Year four 1,237.4   1,237.4   634.5
Year five 602.4   602.4   191.3
PRIOR 322.8   322.8   218.5
REVOLVING LOANS 281.1   281.1   250.6
REVOLVING LOANS CONVERTED TO TERM LOANS 19.1   19.1   5.2
TOTAL LOANS 5,266.0   5,266.0   5,314.2
Year one, Charge-offs     0.0   0.0
Year two, Charge-offs     0.0   0.0
Year three, Charge-offs     0.0   (2.4)
Year four, Charge-offs     (0.1)   0.0
Year five, Charge-offs     0.0   0.0
Prior, Charge-offs     0.0   0.0
REVOLVING LOANS, Charge-offs     0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs     0.0   0.0
Charge-Offs     (0.1)   (2.4)
Commercial | Commercial Real Estate | 1 to 3 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 47.8   47.8   123.2
Year two 121.7   121.7   256.3
Year three 59.1   59.1   224.4
Year four 116.3   116.3   203.7
Year five 69.4   69.4   13.8
PRIOR 42.3   42.3   43.7
REVOLVING LOANS 26.4   26.4   52.6
REVOLVING LOANS CONVERTED TO TERM LOANS 14.0   14.0   0.0
TOTAL LOANS 497.0   497.0   917.7
Commercial | Commercial Real Estate | 4 to 5 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 279.9   279.9   610.1
Year two 695.8   695.8   1,574.2
Year three 1,598.9   1,598.9   1,070.4
Year four 981.7   981.7   424.8
Year five 527.0   527.0   173.2
PRIOR 276.0   276.0   174.4
REVOLVING LOANS 254.7   254.7   198.0
REVOLVING LOANS CONVERTED TO TERM LOANS 5.1   5.1   5.2
TOTAL LOANS 4,619.1   4,619.1   4,230.3
Commercial | Commercial Real Estate | 6 to 9 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0.0   0.0   14.0
Year two 0.0   0.0   15.8
Year three 0.0   0.0   125.7
Year four 139.4   139.4   6.0
Year five 6.0   6.0   4.3
PRIOR 4.5   4.5   0.4
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 149.9   149.9   166.2
Commercial | Non-U.S.          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1,544.2   1,544.2   1,188.5
Year two 145.4   145.4   83.9
Year three 58.3   58.3   14.4
Year four 14.0   14.0   25.0
Year five 0.0   0.0   70.6
PRIOR 315.5   315.5   56.7
REVOLVING LOANS 463.4   463.4   674.8
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 2,540.8   2,540.8   2,113.9
Commercial | Non-U.S. | 1 to 3 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 995.3   995.3   707.1
Year two 79.5   79.5   0.0
Year three 21.2   21.2   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   70.6
PRIOR 150.0   150.0   28.8
REVOLVING LOANS 406.3   406.3   614.9
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 1,652.3   1,652.3   1,421.4
Commercial | Non-U.S. | 4 to 5 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 548.4   548.4   480.5
Year two 65.9   65.9   83.9
Year three 37.1   37.1   0.8
Year four 0.8   0.8   25.0
Year five 0.0   0.0   0.0
PRIOR 165.5   165.5   27.9
REVOLVING LOANS 57.1   57.1   59.9
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 874.8   874.8   678.0
Commercial | Non-U.S. | 6 to 9 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0.5   0.5   0.9
Year two 0.0   0.0   0.0
Year three 0.0   0.0   13.6
Year four 13.2   13.2   0.0
Year five 0.0   0.0   0.0
PRIOR 0.0   0.0   0.0
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 13.7   13.7   14.5
Commercial | Other          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 2,384.7   2,384.7   2,313.6
Year two 0.0   0.0   0.0
Year three 0.0   0.0   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   0.0
PRIOR 0.0   0.0   0.0
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 2,384.7   2,384.7   2,313.6
Year one, Charge-offs         0.0
Year two, Charge-offs         0.0
Year three, Charge-offs         0.0
Year four, Charge-offs         0.0
Year five, Charge-offs         0.0
Prior, Charge-offs         0.0
REVOLVING LOANS, Charge-offs         0.0
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs         0.0
Charge-Offs         0.0
Commercial | Other | 1 to 3 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 1,471.7   1,471.7   1,142.4
Year two 0.0   0.0   0.0
Year three 0.0   0.0   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   0.0
PRIOR 0.0   0.0   0.0
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 1,471.7   1,471.7   1,142.4
Commercial | Other | 4 to 5 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 913.0   913.0   1,171.2
Year two 0.0   0.0   0.0
Year three 0.0   0.0   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   0.0
PRIOR 0.0   0.0   0.0
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 913.0   913.0   1,171.2
Commercial | Other | 6 to 9 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0.0   0.0    
Year two 0.0   0.0    
Year three 0.0   0.0    
Year four 0.0   0.0    
Year five 0.0   0.0    
PRIOR 0.0   0.0    
REVOLVING LOANS 0.0   0.0    
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0    
TOTAL LOANS 0.0   0.0    
Personal          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 850.5   850.5   1,421.2
Year two 1,148.9   1,148.9   1,141.3
Year three 752.5   752.5   1,574.3
Year four 1,418.2   1,418.2   1,552.6
Year five 1,280.2   1,280.2   1,111.5
PRIOR 2,858.6   2,858.6   1,965.8
REVOLVING LOANS 14,362.7   14,362.7   13,707.2
REVOLVING LOANS CONVERTED TO TERM LOANS 566.3   566.3   637.9
TOTAL LOANS 23,237.9   23,237.9   23,111.8
Year one, Charge-offs     0.0   0.0
Year two, Charge-offs     0.0   0.0
Year three, Charge-offs     0.0   0.0
Year four, Charge-offs     0.0   0.0
Year five, Charge-offs     0.0   0.0
Prior, Charge-offs     (0.1)   (0.4)
REVOLVING LOANS, Charge-offs     0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs     0.0   0.0
Charge-Offs (0.1) $ (0.3) (0.1) $ (0.4) (0.4)
Personal | Private Client          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 186.7   186.7   500.3
Year two 709.8   709.8   710.2
Year three 330.5   330.5   468.4
Year four 394.7   394.7   428.4
Year five 212.4   212.4   131.4
PRIOR 307.0   307.0   225.9
REVOLVING LOANS 13,602.8   13,602.8   12,755.6
REVOLVING LOANS CONVERTED TO TERM LOANS 547.0   547.0   628.6
TOTAL LOANS 16,290.9   16,290.9   15,848.8
Year one, Charge-offs     0.0    
Year two, Charge-offs     0.0    
Year three, Charge-offs     0.0    
Year four, Charge-offs     0.0    
Year five, Charge-offs     0.0    
Prior, Charge-offs     (0.1)    
REVOLVING LOANS, Charge-offs     0.0    
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs     0.0    
Charge-Offs     (0.1)    
Personal | Private Client | 1 to 3 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 73.0   73.0   251.3
Year two 144.6   144.6   33.9
Year three 99.9   99.9   84.4
Year four 104.1   104.1   37.9
Year five 50.3   50.3   7.9
PRIOR 28.8   28.8   44.6
REVOLVING LOANS 7,560.2   7,560.2   6,993.2
REVOLVING LOANS CONVERTED TO TERM LOANS 96.3   96.3   93.3
TOTAL LOANS 8,157.2   8,157.2   7,546.5
Personal | Private Client | 4 to 5 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 113.7   113.7   249.0
Year two 565.1   565.1   660.2
Year three 215.0   215.0   384.0
Year four 290.6   290.6   390.5
Year five 162.1   162.1   123.5
PRIOR 278.2   278.2   181.3
REVOLVING LOANS 6,021.3   6,021.3   5,734.8
REVOLVING LOANS CONVERTED TO TERM LOANS 450.1   450.1   535.3
TOTAL LOANS 8,096.1   8,096.1   8,258.6
Personal | Private Client | 6 to 9 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0.0   0.0   0.0
Year two 0.1   0.1   16.1
Year three 15.6   15.6   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   0.0
PRIOR 0.0   0.0   0.0
REVOLVING LOANS 21.3   21.3   27.6
REVOLVING LOANS CONVERTED TO TERM LOANS 0.6   0.6   0.0
TOTAL LOANS 37.6   37.6   43.7
Personal | Residential Real Estate          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 288.0   288.0   411.9
Year two 416.5   416.5   414.1
Year three 409.1   409.1   1,090.7
Year four 1,008.6   1,008.6   1,085.1
Year five 1,044.6   1,044.6   980.1
PRIOR 2,528.5   2,528.5   1,714.2
REVOLVING LOANS 375.4   375.4   411.7
REVOLVING LOANS CONVERTED TO TERM LOANS 12.1   12.1   2.1
TOTAL LOANS 6,082.8   6,082.8   6,109.9
Year one, Charge-offs         0.0
Year two, Charge-offs         0.0
Year three, Charge-offs         0.0
Year four, Charge-offs         0.0
Year five, Charge-offs         0.0
Prior, Charge-offs         (0.1)
REVOLVING LOANS, Charge-offs         0.0
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs         0.0
Charge-Offs         (0.1)
Personal | Residential Real Estate | 1 to 3 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 159.4   159.4   197.5
Year two 173.8   173.8   150.5
Year three 143.9   143.9   436.7
Year four 365.6   365.6   375.2
Year five 405.7   405.7   325.7
PRIOR 1,071.0   1,071.0   743.6
REVOLVING LOANS 166.8   166.8   114.3
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 2,486.2   2,486.2   2,343.5
Personal | Residential Real Estate | 4 to 5 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 128.6   128.6   212.7
Year two 242.7   242.7   263.6
Year three 265.2   265.2   647.2
Year four 636.4   636.4   706.0
Year five 635.8   635.8   652.1
PRIOR 1,426.9   1,426.9   938.1
REVOLVING LOANS 197.1   197.1   270.2
REVOLVING LOANS CONVERTED TO TERM LOANS 1.9   1.9   2.1
TOTAL LOANS 3,534.6   3,534.6   3,692.0
Personal | Residential Real Estate | 6 to 9 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0.0   0.0   1.7
Year two 0.0   0.0   0.0
Year three 0.0   0.0   6.8
Year four 6.6   6.6   3.9
Year five 3.1   3.1   2.3
PRIOR 30.6   30.6   32.5
REVOLVING LOANS 11.5   11.5   27.2
REVOLVING LOANS CONVERTED TO TERM LOANS 10.2   10.2   0.0
TOTAL LOANS 62.0   62.0   74.4
Personal | Non-U.S.          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 10.5   10.5   30.6
Year two 22.6   22.6   17.0
Year three 12.9   12.9   15.2
Year four 14.9   14.9   39.1
Year five 23.2   23.2   0.0
PRIOR 23.1   23.1   25.7
REVOLVING LOANS 384.5   384.5   539.9
REVOLVING LOANS CONVERTED TO TERM LOANS 7.2   7.2   7.2
TOTAL LOANS 498.9   498.9   674.7
Personal | Non-U.S. | 1 to 3 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 2.3   2.3   3.3
Year two 0.4   0.4   1.0
Year three 0.0   0.0   0.0
Year four 0.0   0.0   0.0
Year five 0.5   0.5   0.0
PRIOR 11.9   11.9   6.0
REVOLVING LOANS 111.6   111.6   369.6
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 126.7   126.7   379.9
Personal | Non-U.S. | 4 to 5 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 8.2   8.2   19.5
Year two 14.5   14.5   16.0
Year three 12.9   12.9   15.2
Year four 14.9   14.9   39.1
Year five 22.7   22.7   0.0
PRIOR 10.3   10.3   19.6
REVOLVING LOANS 272.9   272.9   170.3
REVOLVING LOANS CONVERTED TO TERM LOANS 7.2   7.2   7.2
TOTAL LOANS 363.6   363.6   286.9
Personal | Non-U.S. | 6 to 9 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0.0   0.0   7.8
Year two 7.7   7.7   0.0
Year three 0.0   0.0   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   0.0
PRIOR 0.9   0.9   0.1
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 8.6   8.6   7.9
Personal | Other          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 365.3   365.3   478.4
Year two 0.0   0.0   0.0
Year three 0.0   0.0   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   0.0
PRIOR 0.0   0.0   0.0
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 365.3   365.3   478.4
Year one, Charge-offs         0.0
Year two, Charge-offs         0.0
Year three, Charge-offs         0.0
Year four, Charge-offs         0.0
Year five, Charge-offs         0.0
Prior, Charge-offs         (0.3)
REVOLVING LOANS, Charge-offs         0.0
REVOLVING LOANS CONVERTED TO TERM LOANS, Charge-offs         0.0
Charge-Offs         (0.3)
Personal | Other | 1 to 3 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 190.6   190.6   168.5
Year two 0.0   0.0   0.0
Year three 0.0   0.0   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   0.0
PRIOR 0.0   0.0   0.0
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 190.6   190.6   168.5
Personal | Other | 4 to 5 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 174.6   174.6   309.9
Year two 0.0   0.0   0.0
Year three 0.0   0.0   0.0
Year four 0.0   0.0   0.0
Year five 0.0   0.0   0.0
PRIOR 0.0   0.0   0.0
REVOLVING LOANS 0.0   0.0   0.0
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0   0.0
TOTAL LOANS 174.6   174.6   $ 309.9
Personal | Other | 6 to 9 Category          
Financing Receivable, Credit Quality Indicator [Line Items]          
Year one 0.1   0.1    
Year two 0.0   0.0    
Year three 0.0   0.0    
Year four 0.0   0.0    
Year five 0.0   0.0    
PRIOR 0.0   0.0    
REVOLVING LOANS 0.0   0.0    
REVOLVING LOANS CONVERTED TO TERM LOANS 0.0   0.0    
TOTAL LOANS $ 0.1   $ 0.1