Debt - Narrative (Details) - USD ($)	3 Months Ended				6 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Mar. 31, 2023	Dec. 31, 2022	Mar. 31, 2024	Mar. 31, 2023	Dec. 22, 2024	Sep. 30, 2023	Feb. 22, 2023	Jan. 22, 2021	Jul. 01, 2020
Debt Instrument [Line Items]
Loss/(gain) on extinguishment of debt					$ 900,000	$ (2,000,000.0)
Short term borrowing interest rate	7.80%				7.80%			7.70%
Notes payable	$ 1,000,000.0				$ 1,000,000.0			$ 8,200,000
Maturities of long term debt in five years	1,375,000,000				1,375,000,000
Scenario, Forecast
Debt Instrument [Line Items]
Notional value							$ 100,000,000.0
Interest Rate Contracts
Debt Instrument [Line Items]
Notional value	700,000,000.0				$ 700,000,000.0					$ 700,000,000.0
Senior Notes
Debt Instrument [Line Items]
Premiums paid on extinguishment of debt	21,600,000
Write-off of deferred financing fees	$ 300,000
Senior Secured Term Loan Facility due 2027 | Secured Debt
Debt Instrument [Line Items]
Stated interest rate of debt	0.25%				0.25%
Face amount of debt	$ 3,000,000.0				$ 3,000,000.0
Long-term debt	841,000,000.0				841,000,000.0			982,000,000.0
Senior Notes, 4.750%, Due 2028 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate of debt											475.00%
Extinguishment of debt, amount	16,300,000
4.625% Senior Notes due 2026 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	791,300,000				791,300,000			791,300,000
Senior Secured Term Loan B Facility due 2027 | Secured Debt
Debt Instrument [Line Items]
Premiums paid on extinguishment of debt	60,000,000.0	$ 75,000,000.0	$ 100,000,000.0	$ 25,000,000.0
Loss/(gain) on extinguishment of debt	$ 400,000		$ 900,000		$ 900,000	$ 1,100,000
Senior Notes, 4.375%, Due 2029 | Senior Notes
Debt Instrument [Line Items]
Stated interest rate of debt	4.375%				4.375%
Extinguishment of debt, amount	$ 8,700,000
Long-term debt	583,700,000				$ 583,700,000			583,700,000
6.500% Senior Notes due 2027 | Senior Notes
Debt Instrument [Line Items]
Long-term debt	300,000,000.0				300,000,000.0			300,000,000.0
Revolving Credit Facility
Debt Instrument [Line Items]
Amount available remaining	492,400,000				492,400,000
Letter of Credit
Debt Instrument [Line Items]
Outstanding letters of credit	7,600,000				7,600,000
Secured Overnight Financing Rate (SOFR) Overnight Index Swap Rate | Interest Rate Contracts
Debt Instrument [Line Items]
Fixed interest rate									1.042%
Reported Value Measurement
Debt Instrument [Line Items]
Long-term Debt, Percentage Bearing Fixed Interest, Fair Value Amount	$ 2,376,400,000				$ 2,376,400,000			$ 2,362,200,000