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Derivative Financial Instruments - Narrative (Detail) - USD ($)
12 Months Ended
Dec. 31, 2017
Dec. 31, 2016
Derivative [Line Items]    
Reduction in derivative assets due to cash collateral received from derivative counterparties $ 343,300,000 $ 877,200,000
Derivative liability, fair value, amount offset against collateral 381,700,000 336,400,000
Not permitted by contract or custom to sell or repledge 39,900,000 70,700,000
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position 223,700,000 358,200,000
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contingent features that are in a liability position 35,800,000 317,500,000
Termination payments that could have been required for derivative instruments with credit-risk-related contingent features 187,900,000 40,700,000
The net gain/loss recognized in earnings during the period representing the amount of hedge ineffectiveness cash flow hedges $ 0  
Maximum length of time being hedged for exposure to variability in future cash flows of forecasted foreign currency denominated transactions 23 months  
Net foreign exchange contract gains (losses) reclassified from AOCI $ 0  
Net Investment Hedges    
Derivative [Line Items]    
Derivative assets recorded on the consolidated balance sheet, reduced as a result of master netting agreements 1,400,000,000  
Derivative liabilities recorded on the consolidated balance sheet, reduced as a result of master netting agreements   1,700,000,000
Reduction in derivative assets due to cash collateral received from derivative counterparties 427,600,000 461,300,000
Derivative liability, fair value, amount offset against collateral 189,000,000 722,100,000
Not permitted by contract or custom to sell or repledge 67,000,000 70,800,000
Cash collateral deposited with not offset against derivative liabilities $ 143,100,000 $ 324,500,000
Client Related and Trading    
Derivative [Line Items]    
Percentage of derivatives outstanding related to client-related and trading activities 96.00% 96.00%
Securities Available for Sale    
Derivative [Line Items]    
Estimated net gain (loss) to be reclassified into earnings within the next twelve months relating to cash flow hedges $ (100,000)  
Foreign Currency Denominate    
Derivative [Line Items]    
Estimated net gain (loss) to be reclassified into earnings within the next twelve months relating to cash flow hedges 6,200,000  
Foreign Currency Denominated Investment Securities    
Derivative [Line Items]    
Estimated net gain (loss) to be reclassified into earnings within the next twelve months relating to cash flow hedges 1,600,000  
Foreign Exchange Contracts | Net Investment Hedges    
Derivative [Line Items]    
Derivative Instruments, Gain (Loss) Recognized in Other Comprehensive Income (Loss), Effective Portion, Net $ (223,200,000) $ 212,400,000