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Borrowings and Other Arrangements - Long-Term Debt (Details) - Subordinated Debt [Member] - Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate [Member] - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Fixed interest rate 3.25%  
Debt instrument, basis spread on variable rate 2.535%  
Long-term debt, net $ 49.3 $ 49.3