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Loans Held for Investment - Schedule of Recorded Investment in Impaired Loans (Details) - USD ($)
$ in Millions
 3 Months Ended
Mar. 31, 2024
Mar. 31, 2023
Dec. 31, 2023
Dec. 31, 2022
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense $ (5.3) $ (15.2)    
Accounts Receivable, Allowance for Credit Loss 227.7 226.1 $ 227.7 $ 220.1
Off-Balance Sheet, Credit Loss, Liability, Credit Loss Expense (Reversal) 8.4 12.2    
Impaired Financing Receivable, Interest Income, Accrual Method 0.0 0.0    
Total real estate        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense 4.7 (13.4)    
Accounts Receivable, Allowance for Credit Loss 152.9 147.5 160.1 138.7
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 13,647.7   13,656.8  
Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense (11.2) 0.8    
Accounts Receivable, Allowance for Credit Loss 58.0 54.4 50.2 54.9
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,922.2   2,906.8  
Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Provision charged to operating expense 0.5 1.1    
Accounts Receivable, Allowance for Credit Loss 4.2 $ 2.4 4.4 $ 3.2
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 696.0   769.4  
Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 9,060.4   8,869.2  
Residential        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 2,258.4   2,244.3  
Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 719.7   716.8  
Total construction loans        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1,609.2   1,826.5  
Collateral [Member]        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 116.4   52.6  
Collateral [Member] | Total real estate        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 53.0   45.3  
Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 62.3   6.6  
Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1.1   0.7  
Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 35.2   26.6  
Collateral [Member] | Residential        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.5   0.5  
Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1.1   1.2  
Collateral [Member] | Total construction loans        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 16.2   17.0  
Business Assets [Member] | Collateral [Member]        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 61.1   5.2  
Business Assets [Member] | Collateral [Member] | Total real estate        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Business Assets [Member] | Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 60.6   4.5  
Business Assets [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.5   0.7  
Business Assets [Member] | Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Business Assets [Member] | Collateral [Member] | Residential        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Business Assets [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Business Assets [Member] | Collateral [Member] | Total construction loans        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Real Property [Member] | Collateral [Member]        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 54.4   46.7  
Real Property [Member] | Collateral [Member] | Total real estate        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 53.0   45.3  
Real Property [Member] | Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1.0   1.4  
Real Property [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.4   0.0  
Real Property [Member] | Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 35.2   26.6  
Real Property [Member] | Collateral [Member] | Residential        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.5   0.5  
Real Property [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 1.1   1.2  
Real Property [Member] | Collateral [Member] | Total construction loans        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 16.2   17.0  
Other Property [Member] | Collateral [Member]        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.9   0.7  
Other Property [Member] | Collateral [Member] | Total real estate        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Other Property [Member] | Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.7   0.7  
Other Property [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.2   0.0  
Other Property [Member] | Collateral [Member] | Commercial        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Other Property [Member] | Collateral [Member] | Residential        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Other Property [Member] | Collateral [Member] | Agricultural        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss 0.0   0.0  
Other Property [Member] | Collateral [Member] | Total construction loans        
Loans and Leases Receivable Recorded Investment, Impaired [Line Items]        
Financing Receivable, Excluding Accrued Interest, before Allowance for Credit Loss $ 0.0   $ 0.0