v3.24.1.u1
Long-Term Debt - Credit Agreement (Details)
$ in Millions
6 Months Ended
Mar. 31, 2024
USD ($)
Mar. 31, 2023
USD ($)
Sep. 30, 2023
USD ($)
Debt Instrument      
Payments of debt issuance costs and deferred financing fees $ 19.9 $ 1.3  
Debt Covenant, Leverage Ratio 4.25    
Revolving Credit Facility      
Debt Instrument      
Line of Credit Facility, Current Borrowing Capacity $ 1,000.0   $ 750.0
Payments of debt issuance costs and deferred financing fees 7.1    
Proceeds from Lines of Credit 645.0 0.0  
Repayments of Lines of Credit 345.0 $ 0.0  
Letters of Credit Outstanding, Amount 20.5   19.7
Line of Credit Facility, Remaining Borrowing Capacity 679.5   730.3
Long-term Debt $ 300.0   0.0
Line of Credit Facility, Interest Rate at Period End 6.93%    
Debt Covenant, Maximum Undischarged Judgments $ 125.0    
Revolving Credit Facility | High-End Ratio      
Debt Instrument      
Debt Covenant, Leverage Ratio 3.00    
Revolving Credit Facility | Low-End Ratio      
Debt Instrument      
Debt Covenant, Leverage Ratio 1.50    
Revolving Credit Facility | Maximum      
Debt Instrument      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.375%    
Revolving Credit Facility | Minimum      
Debt Instrument      
Line of Credit Facility, Unused Capacity, Commitment Fee Percentage 0.25%    
Revolving Credit Facility | NYFRB      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Revolving Credit Facility | Base Rate | Maximum      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Revolving Credit Facility | Base Rate | Median      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 0.75%    
Revolving Credit Facility | Base Rate | Minimum      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 0.50%    
Revolving Credit Facility | One-Month adjusted term SOFR      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 1.00%    
Revolving Credit Facility | Adjusted term SOFR | Maximum      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 2.00%    
Revolving Credit Facility | Adjusted term SOFR | Median      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 1.75%    
Revolving Credit Facility | Adjusted term SOFR | Minimum      
Debt Instrument      
Debt Instrument, Basis Spread on Variable Rate 1.50%    
Line of Credit      
Debt Instrument      
Line of Credit Facility, Current Borrowing Capacity $ 75.0   $ 75.0