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Loans and Leases (Impaired Loans as of the Period End) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2019
Mar. 31, 2018
Dec. 31, 2018
Financing Receivable, Impaired [Line Items]      
Recorded investment $ 123.3   $ 116.2
Unpaid principal balance 159.1   150.6
Specific allowance 7.7   7.2
Average recorded investment 124.5 $ 136.2  
Interest income recognized 0.6 0.5  
Commercial      
Financing Receivable, Impaired [Line Items]      
Recorded investment 11.7   15.0
Unpaid principal balance 15.0   18.1
Specific allowance 4.8   4.1
Average recorded investment 12.7 28.0  
Interest income recognized 0.0 0.0  
Commercial | Commercial and Institutional      
Financing Receivable, Impaired [Line Items]      
With no related specific reserve, recorded investment 0.1   0.2
With a related specific reserve, recorded investment 7.5   6.4
With no related specific reserve, unpaid principal balance 0.1   0.4
With a related specific reserve, unpaid principal balance 8.8   7.3
Specific allowance 3.7   3.0
With no related specific reserve, average recorded investment 0.1 19.6  
With a related specific reserve, average recorded investment 7.1 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  
Commercial | Real Estate      
Financing Receivable, Impaired [Line Items]      
With no related specific reserve, recorded investment 2.8   5.8
With a related specific reserve, recorded investment 1.3   2.6
With no related specific reserve, unpaid principal balance 4.7   7.6
With a related specific reserve, unpaid principal balance 1.4   2.8
Specific allowance 1.1   1.1
With no related specific reserve, average recorded investment 3.8 6.5  
With a related specific reserve, average recorded investment 1.7 1.9  
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 111.6   101.2
Unpaid principal balance 144.1   132.5
Specific allowance 2.9   3.1
Average recorded investment 111.8 108.2  
Interest income recognized 0.6 0.5  
Personal | Real Estate      
Financing Receivable, Impaired [Line Items]      
With no related specific reserve, recorded investment 88.7   76.7
With a related specific reserve, recorded investment 21.2   22.8
With no related specific reserve, unpaid principal balance 117.6   104.7
With a related specific reserve, unpaid principal balance 24.8   26.1
Specific allowance 2.9   3.1
With no related specific reserve, average recorded investment 89.2 93.8  
With a related specific reserve, average recorded investment 20.9 13.8  
With no related specific reserve, interest income recognized 0.6 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 1.7   1.7
With no related specific reserve, unpaid principal balance 1.7   $ 1.7
With no related specific reserve, average recorded investment 1.7 0.6  
With no related specific reserve, interest income recognized $ 0.0 $ 0.0