v3.25.2
Loans (Loans) (Details) - USD ($)
$ in Millions
Jun. 30, 2025
Dec. 31, 2024
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 43,323.4 $ 43,390.6
Commercial    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 20,085.5 20,278.8
Commercial | Commercial and Institutional    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 9,894.0 10,537.1
Commercial | Commercial and Institutional | Private Equity Funds    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 3,500.0 4,100.0
Commercial | Commercial Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 5,266.0 5,314.2
Commercial | Non-U.S.    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 2,540.8 2,113.9
Commercial | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 2,384.7 2,313.6
Personal    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 23,237.9 23,111.8
Personal | Private Client    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 16,290.9 15,848.8
Personal | Residential Real Estate    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 6,082.8 6,109.9
Personal | Non-U.S.    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases 498.9 674.7
Personal | Other    
Financing Receivable, Credit Quality Indicator [Line Items]    
Loans and leases $ 365.3 $ 478.4