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Impaired Loans by Segment and Class (Detail) - USD ($)
$ in Millions
12 Months Ended
Dec. 31, 2015
Dec. 31, 2014
Financing Receivable, Impaired [Line Items]    
Recorded Investment $ 157.3 $ 242.2
Unpaid principal balance 209.8 301.0
Specific allowance 3.1 6.6
Average recorded investment 212.8 271.2
Interest income recognized 2.3 3.9
Commercial    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 56.3 78.9
Unpaid principal balance 67.4 93.5
Specific allowance 3.0 5.8
Average recorded investment 64.8 90.1
Interest income recognized 0.6 1.3
Commercial | Commercial and Institutional    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 27.1 9.0
With a related specific reserve, recorded investment 9.3 6.5
With no related specific reserve, unpaid principal balance 30.7 12.0
With a related specific reserve, unpaid principal balance 11.4 6.6
Specific allowance 1.6 2.9
With no related specific reserve, average recorded investment 14.4 11.3
With a related specific reserve, average recorded investment 8.5 9.6
With no related specific reserve, interest income recognized 0.0 0.1
Commercial | Commercial Real Estate    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 17.2 47.0
With a related specific reserve, recorded investment   12.2
With no related specific reserve, unpaid principal balance 21.2 52.4
With a related specific reserve, unpaid principal balance 1.4 18.3
Specific allowance   2.9
With no related specific reserve, average recorded investment 31.9 46.1
With a related specific reserve, average recorded investment 6.9 18.8
With no related specific reserve, interest income recognized 0.5 1.0
Commercial | Lease Financing, net    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment   4.2
With a related specific reserve, recorded investment 2.7  
With no related specific reserve, unpaid principal balance   4.2
With a related specific reserve, unpaid principal balance 2.7  
Specific allowance 1.4  
With no related specific reserve, average recorded investment 0.9 4.3
With a related specific reserve, average recorded investment 2.2 0.0
With no related specific reserve, interest income recognized 0.1 0.2
Personal    
Financing Receivable, Impaired [Line Items]    
Recorded Investment 101.0 163.3
Unpaid principal balance 142.4 207.5
Specific allowance 0.1 0.8
Average recorded investment 148.0 181.1
Interest income recognized 1.7 2.6
Personal | Residential Real Estate    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 99.3 160.9
With a related specific reserve, recorded investment 1.5 1.4
With no related specific reserve, unpaid principal balance 140.7 204.8
With a related specific reserve, unpaid principal balance 1.5 1.4
Specific allowance 0.1 0.4
With no related specific reserve, average recorded investment 142.9 176.7
With a related specific reserve, average recorded investment 4.4 3.3
With no related specific reserve, interest income recognized 1.7 2.6
Personal | Private Client    
Financing Receivable, Impaired [Line Items]    
With no related specific reserve, recorded investment 0.2 0.2
With a related specific reserve, recorded investment   0.8
With no related specific reserve, unpaid principal balance 0.2 0.5
With a related specific reserve, unpaid principal balance   0.8
Specific allowance   0.4
With no related specific reserve, average recorded investment 0.3 0.5
With a related specific reserve, average recorded investment $ 0.4 $ 0.6