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Debt - 2027 Senior Notes (Details) - 2027 Senior Notes - USD ($)	6 Months Ended
	Mar. 31, 2025	Feb. 21, 2017
Debt Instrument [Line Items]
Aggregate principal amount		$ 1,000,000,000
Interest rate (as percent)		5.125%
Estimated fair value	$ 997,300,000
Debt Instrument, Redemption, Period One
Debt Instrument [Line Items]
Redemption price (as percent)	100.00%
Debt Instrument, Redemption, Period Two
Debt Instrument [Line Items]
Redemption price (as percent)	100.00%

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