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Other Assets and Other Liabilities - Components of Other Assets (Detail) - USD ($)
$ in Millions
Dec. 31, 2019
Dec. 31, 2018
Schedule Of Other Assets [Line Items]    
Affordable housing investments $ 383.9 $ 304.1
Fair value of derivative financial instruments (notes 20 and 22) 341.0 103.0
Lease ROU assets 279.2  
Leased equipment 191.3 189.0
Accrued interest receivable 156.1 138.2
Funded status of defined benefit pension plans 121.4 78.0
Loan disbursements in process 65.8 17.9
Current income tax receivable 51.7 31.4
Assets held in trust for supplemental retirement plans 51.0 56.4
Net deferred tax asset 33.6 11.4
Other prepaid expenses 32.6 27.5
Economic development investments 29.2 26.2
Investment in joint venture 16.3 17.2
Receivables arising from securities brokerage and insurance businesses 13.0 26.4
Mortgage servicing rights 10.6 0.0
Repossessed assets 4.2 3.9
Other 52.9 46.8
Total other assets 1,853.0 1,091.6
Residential Mortgage Loan [Member]    
Schedule Of Other Assets [Line Items]    
REO 11.9 5.5
Commercial Real Estate Loan [Member]    
Schedule Of Other Assets [Line Items]    
REO $ 7.3 $ 8.7