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Long Term Debt - Credit Agreement (Details)
$ in Millions
12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Sep. 30, 2022
USD ($)
Sep. 30, 2020
USD ($)
Debt Instrument        
Payments of Debt Issuance Costs $ 35.0 $ 3.1 $ 26.4  
Debt Covenant, Leverage Ratio 4.25      
Revolving Credit Facility        
Debt Instrument        
Line of Credit Facility, Current Borrowing Capacity $ 750.0      
Letters of Credit Outstanding, Amount 20.0 19.7    
Line of Credit Facility, Remaining Borrowing Capacity 980.0 $ 730.3    
Debt Covenant, Maximum Undischarged Judgments 125.0      
Proceeds from Lines of Credit 645.0      
Repayments of Lines of Credit $ 645.0      
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 | Federal Funds        
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%      
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%      
Line of Credit        
Debt Instrument        
Line of Credit Facility, Current Borrowing Capacity $ 1,000.0      
Credit Agreement        
Debt Instrument        
Payments of Debt Issuance Costs 6.6     $ 3.6
Letter of Credit        
Debt Instrument        
Line of Credit Facility, Current Borrowing Capacity $ 75.0