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Derivative Financial Instruments (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended 12 Months Ended
Sep. 30, 2015
Sep. 30, 2014
Sep. 30, 2015
Sep. 30, 2014
Dec. 31, 2014
Derivative [Line Items]          
Derivative assets recorded on the consolidated balance sheet, reduced as a result of master netting agreements $ 1,100.0   $ 1,100.0   $ 1,900.0
Derivative liabilities recorded on the consolidated balance sheet, reduced as a result of master netting agreements 0.0   0.0   1,900.0
Reduction in derivative assets due to cash collateral received from derivative counterparties 69.0   69.0   315.8
Reduction in derivative liabilities due to cash collateral deposited with derivative counterparties 1,200.0   1,200.0   1,200.0
This amount represents additional cash collateral received from derivative counterparties not offset against derivative assets 24.3   24.3   19.6
This amount represents additional cash collateral deposited with derivative counterparties not offset against derivative liabilities 218.6   218.6   153.2
Securities posted as collateral 17.1   17.1   27.4
Aggregate fair value of all derivative instruments with credit-risk-related contingent features that are in a liability position 391.4   391.4   299.5
Collateral deposited with derivative counterparties for derivatives instruments with credit-risk-related contingent features that are in a liability position 348.2   348.2   272.9
Termination payments that could have been required for derivative instruments with credit-risk-related contingent features 43.2   43.2   26.6
Ineffectiveness or changes in the fair value of hedged items recognized in earnings for fair value hedges 0.0 $ 0.0 0.0 $ 0.0  
Ineffectiveness recognized in earnings for cash flow hedges $ 0.0 0.0 0.0 0.0  
Maximum length of time hedged cash flow hedges 23 months        
Ineffectiveness from net investment hedges $ 0.0 $ 0.0 0.0 $ 0.0  
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     5.5    
Securities Available for Sale          
Derivative [Line Items]          
Estimated net gain (loss) to be reclassified into net income within the next twelve months relating to cash flow hedges     $ 4.8    
Net Investment Hedges          
Derivative [Line Items]          
Sterling denominated debt designated as hedges of foreign exchange risk         $ 243.9
Client Related and Trading          
Derivative [Line Items]          
Percentage of derivatives outstanding related to client-related and trading activities 97.00%   97.00%   97.00%