Debt - Additional Information (Details)			12 Months Ended
	Sep. 30, 2024 USD ($)	Sep. 30, 2023 USD ($)	Dec. 31, 2023 USD ($) testingPeriod	Dec. 31, 2022 USD ($)	Jul. 31, 2022 USD ($)	Jun. 30, 2022 USD ($)
Debt Instrument [Line Items]
Debt, gross			$ 2,006,800,000
Debt maturing in next twelve months			237,500,000
Other Credit Facilities
Debt Instrument [Line Items]
Credit facility maximum borrowing capacity			20,900,000
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			0	$ 320,000,000.0
Remaining borrowing capacity			$ 900,000,000
Average interest rate at end of period			6.655%
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			6.61%
Term loans (Senior Credit Facility) | 5-year Term Loan Facility
Debt Instrument [Line Items]
Debt, gross			$ 987,500,000	1,000,000,000		$ 1,000,000,000
Installment payments		$ 6,300,000
Average interest rate at end of period			6.891%
Term loans (Senior Credit Facility) | 5-year Term Loan Facility | Subsequent Event | Forecast
Debt Instrument [Line Items]
Installment payments	$ 12,500,000
Senior Notes | 5.900% Senior Notes
Debt Instrument [Line Items]
Debt, gross			$ 400,000,000.0	$ 400,000,000.0	$ 400,000,000
Average interest rate at end of period			5.90%		5.90%