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Loans and Leases (Impaired Loans as of the Period End) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]      
Recorded Investment $ 119.2   $ 139.8
Unpaid principal balance 163.5   186.6
Specific allowance 5.0   5.4
Average recorded investment 148.4 $ 168.2  
Interest income recognized 0.5 0.6  
Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 11.8   33.9
Unpaid principal balance 19.6   46.1
Specific allowance 0.9   1.1
Average recorded investment 28.7 29.3  
Interest income recognized 0.0 0.1  
Commercial | Commercial and Institutional      
Financing Receivable, Impaired [Line Items]      
With no related specific reserve, recorded investment 3.8   24.9
With a related specific reserve, recorded investment 0.5   0.5
With no related specific reserve, unpaid principal balance 4.8   30.3
With a related specific reserve, unpaid principal balance 5.4   5.4
Specific allowance 0.5   0.5
With no related specific reserve, average recorded investment 19.6 7.8  
With a related specific reserve, average recorded investment 0.5 5.7  
With no related specific reserve, interest income recognized 0.0 0.0  
With a related specific reserve, interest income recognized 0.0 0.0  
Commercial | Real Estate      
Financing Receivable, Impaired [Line Items]      
With no related specific reserve, recorded investment 6.0   5.7
With a related specific reserve, recorded investment 1.5   2.8
With no related specific reserve, unpaid principal balance 7.9   7.6
With a related specific reserve, unpaid principal balance 1.5   2.8
Specific allowance 0.4   0.6
With no related specific reserve, average recorded investment 6.7 13.9  
With a related specific reserve, average recorded investment 1.9 1.9  
With no related specific reserve, interest income recognized 0.0 0.1  
With a related specific reserve, interest income recognized 0.0 0.0  
Commercial | Lease Financing, net      
Financing Receivable, Impaired [Line Items]      
With no related specific reserve, average recorded investment 0.0 0.0  
With a related specific reserve, average recorded investment 0.0 0.0  
With no related specific reserve, interest income recognized 0.0 0.0  
With a related specific reserve, interest income recognized 0.0 0.0  
Personal      
Financing Receivable, Impaired [Line Items]      
Recorded Investment 107.4   105.9
Unpaid principal balance 143.9   140.5
Specific allowance 4.1   4.3
Average recorded investment 119.7 138.9  
Interest income recognized 0.5 0.5  
Personal | Real Estate      
Financing Receivable, Impaired [Line Items]      
With no related specific reserve, recorded investment 94.0   90.9
With a related specific reserve, recorded investment 12.8   14.3
With no related specific reserve, unpaid principal balance 129.9   124.9
With a related specific reserve, unpaid principal balance 13.4   14.9
Specific allowance 4.1   4.3
With no related specific reserve, average recorded investment 105.4 122.1  
With a related specific reserve, average recorded investment 13.8 16.6  
With no related specific reserve, interest income recognized 0.5 0.5  
With a related specific reserve, interest income recognized 0.0 0.0  
Personal | Private Client      
Financing Receivable, Impaired [Line Items]      
With no related specific reserve, recorded investment 0.6   0.7
With no related specific reserve, unpaid principal balance 0.6   $ 0.7
With no related specific reserve, average recorded investment 0.5 0.2  
With no related specific reserve, interest income recognized $ 0.0 $ 0.0