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Loans and Leases (Impaired Loans as of the Period End) (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2018
Jun. 30, 2017
Jun. 30, 2018
Jun. 30, 2017
Dec. 31, 2017
Financing Receivable, Impaired [Line Items]          
Recorded investment $ 131.8   $ 131.8   $ 139.8
Unpaid principal balance 170.3   170.3   186.6
Specific allowance 6.1   6.1   5.4
Average recorded investment 139.5 $ 168.6 143.9 $ 168.5  
Interest income recognized 0.5 0.4 1.0 1.0  
Commercial          
Financing Receivable, Impaired [Line Items]          
Recorded investment 22.3   22.3   33.9
Unpaid principal balance 25.3   25.3   46.1
Specific allowance 4.2   4.2   1.1
Average recorded investment 15.8 35.5 22.2 32.4  
Interest income recognized 0.1 0.0 0.1 0.1  
Commercial | Commercial and Institutional          
Financing Receivable, Impaired [Line Items]          
With no related specific reserve, recorded investment 3.5   3.5   24.9
With a related specific reserve, recorded investment 10.6   10.6   0.5
With no related specific reserve, unpaid principal balance 4.5   4.5   30.3
With a related specific reserve, unpaid principal balance 10.6   10.6   5.4
Specific allowance 2.9   2.9   0.5
With no related specific reserve, average recorded investment 3.6 10.9 11.6 9.3  
With a related specific reserve, average recorded investment 3.5 12.4 2.0 9.0  
With no related specific reserve, interest income recognized 0.0 0.0 0.0 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 5.6   5.6   5.7
With a related specific reserve, recorded investment 2.6   2.6   2.8
With no related specific reserve, unpaid principal balance 7.4   7.4   7.6
With a related specific reserve, unpaid principal balance 2.8   2.8   2.8
Specific allowance 1.3   1.3   0.6
With no related specific reserve, average recorded investment 7.3 9.4 7.0 11.7  
With a related specific reserve, average recorded investment 1.4 2.8 1.6 2.4  
With no related specific reserve, interest income recognized 0.1 0.0 0.1 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 109.5   109.5   105.9
Unpaid principal balance 145.0   145.0   140.5
Specific allowance 1.9   1.9   4.3
Average recorded investment 123.7 133.1 121.7 136.1  
Interest income recognized 0.4 0.4 0.9 0.9  
Personal | Real Estate          
Financing Receivable, Impaired [Line Items]          
With no related specific reserve, recorded investment 102.3   102.3   90.9
With a related specific reserve, recorded investment 6.7   6.7   14.3
With no related specific reserve, unpaid principal balance 137.5   137.5   124.9
With a related specific reserve, unpaid principal balance 7.0   7.0   14.9
Specific allowance 1.9   1.9   4.3
With no related specific reserve, average recorded investment 112.4 112.7 108.9 117.4  
With a related specific reserve, average recorded investment 10.7 20.3 12.2 18.5  
With no related specific reserve, interest income recognized 0.4 0.4 0.9 0.9  
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 0.5   0.5   0.7
With no related specific reserve, unpaid principal balance 0.5   0.5   $ 0.7
With no related specific reserve, average recorded investment 0.6 0.1 0.6 0.2  
With no related specific reserve, interest income recognized $ 0.0 $ 0.0 $ 0.0 $ 0.0