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Impaired Loans by Segment and Class (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2016
Dec. 31, 2015
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 156.1 $ 157.3
Unpaid principal balance 199.8 209.8
Specific allowance 2.1 3.1
Average recorded investment 159.7 212.8
Interest income recognized 2.3 2.3
Commercial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 46.9 56.3
Unpaid principal balance 53.2 67.4
Specific allowance 0.0 3.0
Average recorded investment 59.5 64.8
Interest income recognized 0.4 0.6
Commercial | Commercial and Institutional    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 32.2 27.1
With a related specific reserve, recorded investment 0.0 9.3
With no related specific reserve, unpaid principal balance 34.6 30.7
With a related specific reserve, unpaid principal balance 0.0 11.4
Specific allowance 0.0 1.6
With no related specific reserve, average recorded investment 33.1 14.4
With a related specific reserve, average recorded investment 7.6 8.5
With no related specific reserve, interest income recognized 0.0 0.0
With a related specific allowance, interest income recognized 0.0 0.0
Commercial | Real Estate    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 14.7 17.2
With a related specific reserve, recorded investment 0.0 0.0
With no related specific reserve, unpaid principal balance 18.6 21.2
With a related specific reserve, unpaid principal balance 0.0 1.4
Specific allowance 0.0 0.0
With no related specific reserve, average recorded investment 17.0 31.9
With a related specific reserve, average recorded investment 0.0 6.9
With no related specific reserve, interest income recognized 0.3 0.5
With a related specific allowance, interest income recognized 0.0 0.0
Commercial | Lease Financing, net    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 0.0 0.0
With a related specific reserve, recorded investment 0.0 2.7
With no related specific reserve, unpaid principal balance 0.0 0.0
With a related specific reserve, unpaid principal balance 0.0 2.7
Specific allowance 0.0 1.4
With no related specific reserve, average recorded investment 0.6 0.9
With a related specific reserve, average recorded investment 1.2 2.2
With no related specific reserve, interest income recognized 0.1 0.1
With a related specific allowance, interest income recognized 0.0 0.0
Personal    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 109.2 101.0
Unpaid principal balance 146.6 142.4
Specific allowance 2.1 0.1
Average recorded investment 100.2 148.0
Interest income recognized 1.9 1.7
Personal | Real Estate    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 101.2 99.3
With a related specific reserve, recorded investment 7.7 1.5
With no related specific reserve, unpaid principal balance 138.4 140.7
With a related specific reserve, unpaid principal balance 7.9 1.5
Specific allowance 2.1 0.1
With no related specific reserve, average recorded investment 96.9 142.9
With a related specific reserve, average recorded investment 2.1 4.4
With no related specific reserve, interest income recognized 1.9 1.7
With a related specific allowance, interest income recognized 0.0 0.0
Personal | Private Client    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 0.3 0.2
With a related specific reserve, recorded investment 0.0 0.0
With no related specific reserve, unpaid principal balance 0.3 0.2
With a related specific reserve, unpaid principal balance 0.0 0.0
Specific allowance 0.0 0.0
With no related specific reserve, average recorded investment 1.2 0.3
With a related specific reserve, average recorded investment 0.0 0.4
With no related specific reserve, interest income recognized 0.0 0.0
With a related specific allowance, interest income recognized $ 0.0 $ 0.0