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Loans and Allowance for Credit Losses - Narrative (Details)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 30, 2022
USD ($)
loan
Sep. 30, 2021
USD ($)
Sep. 30, 2022
USD ($)
loan
loanSegment
Sep. 30, 2021
USD ($)
Dec. 31, 2021
USD ($)
loan
Financing Receivable, Credit Quality Indicator [Line Items]          
Number of loans and leases segments | loanSegment     2    
Loans pledged as collateral $ 36,016.0   $ 36,016.0   $ 32,445.0
Number of loans on non-accrual status | loan 0   0   0
Financing receivable, held-for-sale         $ 8.0
Loans modified in troubled debt restructurings | loan 0        
Loans no longer meeting similar risk of collective pool | loan 11   11    
Loans no longer meeting similar risk of collective pool, amount $ 130.0   $ 130.0    
Allowance for credit losses on loans $ 97.0   $ 97.0   87.0
Investment grade loans 83.00%   83.00%    
Speculative grade loans 15.00%   15.00%    
Speculative senior secured loans with BB or B rating 97.00%   97.00%    
Provision for credit losses $ 0.0 $ (2.0) $ 10.0 $ (26.0)  
Finance receivables, allowance for credit loss, period increase (decrease)   $ 4.0      
Asset pledged as collateral          
Financing Receivable, Credit Quality Indicator [Line Items]          
Loans pledged as collateral 9,760.0   9,760.0   $ 10,080.0
Leveraged Loans          
Financing Receivable, Credit Quality Indicator [Line Items]          
Financing receivable for sale 21.0        
Commercial and Financial          
Financing Receivable, Credit Quality Indicator [Line Items]          
Allowance for credit losses on loans $ 8.0   $ 8.0