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Allowance for Credit Losses on Loans and Leases - Narrative (Details) - USD ($)
$ in Millions
12 Months Ended
Jan. 01, 2020
Dec. 31, 2020
Dec. 31, 2019
Mar. 31, 2020
Dec. 31, 2018
Dec. 31, 2017
Financing Receivable, Allowance for Credit Loss [Line Items]            
Stockholders' equity attributable to parent   $ 4,959.0 $ 4,883.0   $ 4,608.0 $ 4,409.0
Financing receivable, allowance for credit loss, period increase (decrease) $ 105.3 167.2        
Allowance for credit loss 196.0 363.0 196.0   180.0 175.0
Percentage of growth, gross domestic product       4.00%    
Percentage of increase, unemployment       6.00%    
Allowance for credit loss, net   $ 363.1        
Financing receivable, allowance for credit loss, period increase (decrease), percentage   85.40%        
Financing receivable, allowance for credit loss, ratio   1.43%        
Provision for credit losses   $ 122.8        
Financing receivable, allowance for credit loss, write-off   $ 59.8 28.3      
Financing receivable, allowance for credit loss, writeoff, net, basis points   0.0024        
Impact of ASC 326 Adoption            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Stockholders' equity attributable to parent     (50.0)      
Allowance for credit loss 105.0          
Retained Earnings            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Stockholders' equity attributable to parent   $ 869.0 798.0   $ 576.0 $ 368.0
Retained Earnings | Impact of ASC 326 Adoption            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Stockholders' equity attributable to parent     $ (50.0)      
Accounting Standards Update 2016-13            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Allowance for credit loss 301.0          
Accounting Standards Update 2016-13 | Retained Earnings            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Stockholders' equity attributable to parent (51.0)          
Accounting Standards Update 2016-13 | Retained Earnings | Impact of ASC 326 Adoption            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Stockholders' equity attributable to parent (50.6)          
Longer Duration Loans and Gross Up | Accounting Standards Update 2016-13            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing receivable, allowance for credit loss, period increase (decrease) 50.0          
Unfunded Loan Commitment | Accounting Standards Update 2016-13            
Financing Receivable, Allowance for Credit Loss [Line Items]            
Financing receivable, allowance for credit loss, period increase (decrease) 10.0          
Allowance for credit loss $ 10.0