v3.26.1
Loans, Leases and Allowance for Credit Losses - Allowances for Credit Losses (Detail) - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2026
Jun. 30, 2025
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance $ 461.1 $ 388.6 $ 460.6 $ 373.8
Provision for (Recovery of) Credit Losses 81.3 35.7 290.3 76.3
Charge-offs 57.6 35.3 266.7 62.8
Recoveries (2.6) (5.7) (3.2) (7.4)
Ending balance 487.4 394.7 487.4 394.7
Off-Balance-Sheet, Credit Loss, Liability [Roll Forward]        
Balance, beginning of period 53.3 35.1 49.6 39.5
(Recovery of) provision for credit losses (1.3) 4.1 2.4 (0.3)
Balance, end of period 52.0 39.2 52.0 39.2
Mortgage finance        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 5.7 4.5 5.5 4.8
Provision for (Recovery of) Credit Losses 0.4 (0.1) 0.6 (0.4)
Charge-offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 0.0
Ending balance 6.1 4.4 6.1 4.4
Municipal & nonprofit        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 18.4 14.8 13.0 14.7
Provision for (Recovery of) Credit Losses (2.7) (3.5) 2.7 (3.4)
Charge-offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 0.0
Ending balance 15.7 11.3 15.7 11.3
Tech & innovation        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 52.9 44.9 44.8 55.9
Provision for (Recovery of) Credit Losses 18.5 10.4 47.0 10.6
Charge-offs 20.2 9.7 41.0 21.8
Recoveries (1.0) (0.1) (1.4) (1.0)
Ending balance 52.2 45.7 52.2 45.7
Equity fund resources        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 4.0 1.4 2.6 1.6
Provision for (Recovery of) Credit Losses 0.7 0.8 2.1 0.6
Charge-offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 0.0
Ending balance 4.7 2.2 4.7 2.2
Other commercial and industrial        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 174.0 93.5 184.7 79.4
Provision for (Recovery of) Credit Losses 6.6 23.4 155.7 38.3
Charge-offs 4.4 6.7 164.4 7.6
Recoveries (0.5) (0.5) (0.7) (0.6)
Ending balance 176.7 110.7 176.7 110.7
CRE - owner occupied        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 3.6 3.7 3.4 3.4
Provision for (Recovery of) Credit Losses (0.4) 0.7 (0.2) 0.9
Charge-offs 0.1 0.5 0.1 0.5
Recoveries 0.0 0.0 0.0 (0.1)
Ending balance 3.1 3.9 3.1 3.9
Hotel franchise finance        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 40.5 33.2 37.7 35.3
Provision for (Recovery of) Credit Losses 2.0 2.8 4.8 0.1
Charge-offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 (0.6)
Ending balance 42.5 36.0 42.5 36.0
Other CRE - non-owner occupied        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 99.4 138.1 110.4 134.4
Provision for (Recovery of) Credit Losses 57.1 (0.7) 73.8 17.5
Charge-offs 32.0 17.5 59.7 32.0
Recoveries (1.1) (5.1) (1.1) (5.1)
Ending balance 125.6 125.0 125.6 125.0
Residential        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 23.7 19.7 23.7 19.7
Provision for (Recovery of) Credit Losses (0.6) 0.2 (0.6) 0.2
Charge-offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 0.0
Ending balance 23.1 19.9 23.1 19.9
Residential EBO        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 0.0 0.0 0.0 0.0
Provision for (Recovery of) Credit Losses 0.0 0.0 0.0 0.0
Charge-offs 0.0 0.0 0.0 0.0
Recoveries 0.0 0.0 0.0 0.0
Ending balance 0.0 0.0 0.0 0.0
Construction and land development        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 37.6 32.0 32.3 21.3
Provision for (Recovery of) Credit Losses (2.1) 1.9 3.2 12.6
Charge-offs 0.1 0.3 0.1 0.3
Recoveries 0.0 0.0 0.0 0.0
Ending balance 35.4 33.6 35.4 33.6
Other        
Accounts Receivable, Allowance for Credit Loss [Roll Forward]        
Beginning balance 1.3 2.8 2.5 3.3
Provision for (Recovery of) Credit Losses 1.8 (0.2) 1.2 (0.7)
Charge-offs 0.8 0.6 1.4 0.6
Recoveries 0.0 0.0 0.0 0.0
Ending balance $ 2.3 $ 2.0 $ 2.3 $ 2.0