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Derivative Financial Instruments (Narrative) (Details) - USD ($)
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Dec. 31, 2017
Derivative [Line Items]      
Derivative assets recorded on the consolidated balance sheet, reduced as a result of master netting agreements $ 900,000,000    
Derivative liabilities recorded on the consolidated balance sheet, reduced as a result of master netting agreements     $ 1,700,000,000
Derivative asset, fair value, amount offset against collateral 524,200,000   343,300,000
Gross Amount of Recognized Liabilities for Repurchase Agreements in Note 22 122,500,000   381,700,000
This amount represents additional cash collateral received from derivative counterparties not offset against derivative assets 37,800,000   39,900,000
Gains or losses reclassified into earnings $ 0 $ 0  
Maximum length of time over which exposure was being hedged 23 months    
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position $ 217,600,000   223,700,000
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contingent features that are in a liability position 197,900,000   35,800,000
Termination payments that could have been required for derivative instruments with credit-risk-related contingent features 19,700,000   187,900,000
Ineffectiveness or changes in the fair value of hedged items recognized in earnings for fair value hedges 0 0  
Ineffectiveness recognized in earnings for cash flow hedges 0 0  
Ineffectiveness from net investment hedges 0 0  
Net Investment Hedges      
Derivative [Line Items]      
Derivative assets recorded on the consolidated balance sheet, reduced as a result of master netting agreements 1,100,000,000    
Derivative liabilities recorded on the consolidated balance sheet, reduced as a result of master netting agreements     1,400,000,000
Derivative asset, fair value, amount offset against collateral 74,900,000   427,600,000
Gross Amount of Recognized Liabilities for Repurchase Agreements in Note 22 443,800,000   189,000,000
This amount represents additional cash collateral received from derivative counterparties not offset against derivative assets 245,800,000   67,000,000
This amount represents additional cash collateral deposited with derivative counterparties not offset against derivative liabilities $ 248,300,000   $ 143,100,000
Client Related and Trading      
Derivative [Line Items]      
Percentage of derivatives outstanding related to client-related and trading activities 96.00%   96.00%
Foreign Currency Denominate      
Derivative [Line Items]      
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges $ 4,400,000    
Foreign Currency Denominated Debt Securities      
Derivative [Line Items]      
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges 500,000    
Available for Sale Debt Securities      
Derivative [Line Items]      
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges 800,000    
Foreign Exchange Contracts | Net Investment Hedges      
Derivative [Line Items]      
Derivative instruments, gain (loss) recognized in other comprehensive income (loss), effective portion, net $ 74,300,000 $ 30,500,000