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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, 2017
Sep. 30, 2016
Sep. 30, 2017
Sep. 30, 2016
Dec. 31, 2016
Financing Receivable, Impaired [Line Items]          
Recorded Investment $ 126.9   $ 126.9   $ 156.1
Unpaid principal balance 168.6   168.6   199.8
Specific allowance 8.6   8.6   2.1
Average recorded investment 130.3 $ 156.8 155.7 $ 156.5  
Interest income recognized 0.2 0.6 1.2 1.8  
Commercial          
Financing Receivable, Impaired [Line Items]          
Recorded Investment 17.2   17.2   22.6
Unpaid principal balance 23.9   23.9   27.3
Specific allowance 4.0   4.0   0.0
Average recorded investment 20.8 36.2 28.5 32.7  
Interest income recognized 0.0 0.2 0.1 0.4  
Commercial | Commercial and Institutional          
Financing Receivable, Impaired [Line Items]          
With no related specific reserve, recorded investment 3.7   3.7   7.9
With a related specific reserve, recorded investment 4.1   4.1   0.0
With no related specific reserve, unpaid principal balance 4.5   4.5   8.7
With a related specific reserve, unpaid principal balance 8.2   8.2   0.0
Specific allowance 3.3   3.3   0.0
With no related specific reserve, average recorded investment 5.1 10.6 7.9 6.1  
With a related specific reserve, average recorded investment 5.8 6.7 7.9 7.2  
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 6.6   6.6   14.7
With a related specific reserve, recorded investment 2.8   2.8   0.0
With no related specific reserve, unpaid principal balance 8.4   8.4   18.6
With a related specific reserve, unpaid principal balance 2.8   2.8   0.0
Specific allowance 0.7   0.7   0.0
With no related specific reserve, average recorded investment 7.1 17.5 10.2 17.4  
With a related specific reserve, average recorded investment 2.8 0.0 2.5 0.0  
With no related specific reserve, interest income recognized 0.0 0.2 0.1 0.3  
With a related specific reserve, interest income recognized 0.0 0.0 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 0.0 0.6  
With a related specific reserve, average recorded investment 0.0 1.4 0.0 1.4  
With no related specific reserve, interest income recognized 0.0 0.0 0.0 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 109.7   109.7   133.5
Unpaid principal balance 144.7   144.7   172.5
Specific allowance 4.6   4.6   2.1
Average recorded investment 109.5 120.6 127.2 123.8  
Interest income recognized 0.2 0.4 1.1 1.4  
Personal | Real Estate          
Financing Receivable, Impaired [Line Items]          
With no related specific reserve, recorded investment 95.5   95.5   125.5
With a related specific reserve, recorded investment 14.2   14.2   7.7
With no related specific reserve, unpaid principal balance 129.9   129.9   164.3
With a related specific reserve, unpaid principal balance 14.8   14.8   7.9
Specific allowance 4.6   4.6   2.1
With no related specific reserve, average recorded investment 92.7 116.7 109.2 121.0  
With a related specific reserve, average recorded investment 16.7 1.6 17.9 1.5  
With no related specific reserve, interest income recognized 0.2 0.4 1.1 1.4  
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 0.0   0.0   0.3
With no related specific reserve, unpaid principal balance 0.0   0.0   $ 0.3
With no related specific reserve, average recorded investment 0.1 2.3 0.1 1.3  
With no related specific reserve, interest income recognized $ 0.0 $ 0.0 $ 0.0 $ 0.0