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Financing and Other Debt - Schedule of Short Term Debt (Details) - USD ($)
$ in Millions
 6 Months Ended 12 Months Ended
Jun. 30, 2024
Dec. 31, 2023
Debt Instrument [Line Items]    
Total short term debt, net $ 1,248.6 $ 1,041.1
Current portion of long-term debt 52.6 55.1
Participation debt    
Debt Instrument [Line Items]    
Total short term debt, net $ 27.0 $ 39.1
Interest rate during period (as a percent) 7.59% 7.62%
FHLB advances    
Debt Instrument [Line Items]    
Total short term debt, net $ 300.0 $ 0.0
Interest rate during period (as a percent) 5.50% 0.00%
Borrowed federal funds    
Debt Instrument [Line Items]    
Total short term debt, net $ 760.0 $ 845.0
Interest rate during period (as a percent) 4.76% 4.89%
Other short term borrowings    
Debt Instrument [Line Items]    
Total short term debt, net $ 8.7 $ 0.0
Interest rate during period (as a percent) 6.15% 0.00%
Securitized debt    
Debt Instrument [Line Items]    
Total short term debt, net $ 100.4 $ 101.9
Interest rate during period (as a percent) 5.77% 5.85%