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Loans and Leases (Impaired Loans as of the Period End) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2018
Sep. 30, 2017
Sep. 30, 2018
Sep. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 116.2   $ 116.2   $ 139.8
Unpaid principal balance 151.6   151.6   186.6
Specific allowance 4.4   4.4   5.4
Average recorded investment 122.5 $ 130.3 128.3 $ 155.7  
Interest income recognized 4.8 0.2 5.8 1.2  
Commercial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 18.9   18.9   33.9
Unpaid principal balance 21.8   21.8   46.1
Specific allowance 4.2   4.2   1.1
Average recorded investment 21.2 20.8 21.5 28.5  
Interest income recognized 3.3 0.0 3.4 0.1  
Commercial | Commercial and Institutional          
Financing Receivable, Impaired [Line Items]          
With no related specific reserve, recorded investment 0.2   0.2   24.9
With a related specific reserve, recorded investment 9.1   9.1   0.5
With no related specific reserve, unpaid principal balance 0.6   0.6   30.3
With a related specific reserve, unpaid principal balance 9.5   9.5   5.4
Specific allowance 3.0   3.0   0.5
With no related specific reserve, average recorded investment 3.0 5.1 8.7 7.9  
With a related specific reserve, average recorded investment 9.6 5.8 4.4 7.9  
With no related specific reserve, interest income recognized 3.2 0.0 3.2 0.0  
With a related specific reserve, interest income recognized 0.0 0.0 0.0 0.0  
Commercial | Real Estate          
Financing Receivable, Impaired [Line Items]          
With no related specific reserve, recorded investment 7.0   7.0   5.7
With a related specific reserve, recorded investment 2.6   2.6   2.8
With no related specific reserve, unpaid principal balance 8.9   8.9   7.6
With a related specific reserve, unpaid principal balance 2.8   2.8   2.8
Specific allowance 1.2   1.2   0.6
With no related specific reserve, average recorded investment 6.0 7.1 6.4 10.2  
With a related specific reserve, average recorded investment 2.6 2.8 2.0 2.5  
With no related specific reserve, interest income recognized 0.1 0.0 0.2 0.1  
With a related specific reserve, interest income recognized 0.0 0.0 0.0 0.0  
Personal          
Financing Receivable, Impaired [Line Items]          
Recorded investment 97.3   97.3   105.9
Unpaid principal balance 129.8   129.8   140.5
Specific allowance 0.2   0.2   4.3
Average recorded investment 101.3 109.5 106.8 127.2  
Interest income recognized 1.5 0.2 2.4 1.1  
Personal | Real Estate          
Financing Receivable, Impaired [Line Items]          
With no related specific reserve, recorded investment 96.5   96.5   90.9
With a related specific reserve, recorded investment 0.4   0.4   14.3
With no related specific reserve, unpaid principal balance 129.0   129.0   124.9
With a related specific reserve, unpaid principal balance 0.4   0.4   14.9
Specific allowance 0.2   0.2   4.3
With no related specific reserve, average recorded investment 96.2 92.7 96.6 109.2  
With a related specific reserve, average recorded investment 4.6 16.7 9.7 17.9  
With no related specific reserve, interest income recognized 1.5 0.2 2.4 1.1  
With a related specific reserve, interest income recognized 0.0 0.0 0.0 0.0  
Personal | Private Client          
Financing Receivable, Impaired [Line Items]          
With no related specific reserve, recorded investment 0.4   0.4   0.7
With no related specific reserve, unpaid principal balance 0.4   0.4   $ 0.7
With no related specific reserve, average recorded investment 0.5 0.1 0.5 0.1  
With no related specific reserve, interest income recognized $ 0.0 $ 0.0 $ 0.0 $ 0.0