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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2022
USD ($)
loan
Jun. 30, 2021
USD ($)
Jun. 30, 2022
USD ($)
loan
loanSegment
Jun. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of loans and leases segments | loanSegment     2    
Number of loans on non-accrual status | loan 0   0   0
Financing receivable, held-for-sale $ 155.0   $ 155.0   $ 8.0
Loans modified in troubled debt restructurings | loan 0        
Loans no longer meeting similar risk of collective pool | loan 5   5    
Loans no longer meeting similar risk of collective pool, amount $ 130.0   $ 130.0    
Allowance for credit losses on loans $ 95.0   $ 95.0   87.0
Investment grade loans 86.00%   86.00%    
Speculative grade loans 12.00%   12.00%    
Speculative senior secured loans with BB or B rating 96.00%   96.00%    
Provision for credit losses $ 10.0 $ (15.0) $ 10.0 $ (24.0)  
Finance receivables, allowance for credit loss, period increase (decrease)   $ 14.0      
Loans, pledged as collateral (33,470.0)   (33,470.0)   (32,445.0)
Asset pledged as collateral          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans, pledged as collateral (10,920.0)   (10,920.0)   $ (10,080.0)
Leveraged Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Financing receivable for sale 1,630.0        
Financing receivable, held-for-sale 155.0   155.0    
Commercial and Financial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Allowance for credit losses on loans $ 7.0   $ 7.0