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Debt - Additional Information (Details)
12 Months Ended
Sep. 30, 2024
USD ($)
Sep. 30, 2023
USD ($)
Dec. 31, 2022
USD ($)
testingPeriod
Jul. 31, 2022
USD ($)
Jun. 30, 2022
USD ($)
Mar. 24, 2022
USD ($)
Dec. 31, 2021
USD ($)
Debt Instrument [Line Items]              
Debt, gross     $ 2,339,300,000        
Debt maturing in next twelve months     12,500,000        
Other Credit Facilities              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity     21,000,000        
Line of credit facility, amount outstanding     0        
Line of Credit | Revolving credit facility (Senior Credit Facility)              
Debt Instrument [Line Items]              
Credit facility maximum borrowing capacity     900,000,000        
Debt, gross     320,000,000.0       $ 195,000,000.0
Remaining borrowing capacity     $ 580,000,000        
Average interest rate at end of period     6.053%        
Leverage ratio covenant     3.75        
EBITDA ratio covenant     3.00        
Line of Credit | Revolving credit facility (Senior Credit Facility) | PFSA              
Debt Instrument [Line Items]              
Leverage ratio covenant     4.25        
Number of testing periods | testingPeriod     4        
Line of Credit | Revolving credit facility (Senior Credit Facility) | Minimum              
Debt Instrument [Line Items]              
Covenant, unrestricted cash     $ 5,000,000        
Line of Credit | Revolving credit facility (Senior Credit Facility) | Maximum              
Debt Instrument [Line Items]              
Covenant, unrestricted cash     250,000,000        
Term loans (Senior Credit Facility) | Term Loans, 1.224% due in 2023              
Debt Instrument [Line Items]              
Debt, gross     200,000,000       200,000,000.0
Line of credit increase limit     $ 300,000,000        
Average interest rate at end of period     5.861%        
Term loans (Senior Credit Facility) | 5-year Term Loan Facility              
Debt Instrument [Line Items]              
Debt, gross     $ 1,000,000,000   $ 1,000,000,000 $ 600,000,000 0
Increase to obligation         $ 400,000,000    
Average interest rate at end of period     5.463%        
Term loans (Senior Credit Facility) | 5-year Term Loan Facility | Subsequent Event | Forecast              
Debt Instrument [Line Items]              
Installment payments $ 12,500,000 $ 6,300,000          
Senior Notes | 5.900% Senior Notes              
Debt Instrument [Line Items]              
Debt, gross     $ 400,000,000.0 $ 400,000,000     $ 0
Average interest rate at end of period     5.90% 5.90%