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Debt - Schedule of Short-Term Borrowings and Long Term Debt (Details) - USD ($)	Mar. 31, 2020	Feb. 25, 2020	Sep. 30, 2019	Aug. 31, 2017
Debt Instrument [Line Items]
Other	$ (12,000,000)		$ (8,000,000)
Current portion of long-term debt	0		15,000,000
Long-term debt	2,003,000,000		1,327,000,000
Total debt	2,003,000,000		1,342,000,000
Debt acquired through acquisitions	1,000,000		1,000,000
Debt issuance cost discounts	13,000,000		9,000,000
Line of Credit \| Revolver
Debt Instrument [Line Items]
Long-term debt	450,000,000		0
Senior Unsecured Notes Due 2030 [Domain] \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount		$ 600,000,000	0
2025 Notes \| Senior Notes
Debt Instrument [Line Items]
Aggregate principal amount				$ 400,000,000
Debt gross	400,000,000		400,000,000
2024 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt gross	0	$ (375,000,000)	375,000,000
Term Loan \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt gross	475,000,000		575,000,000
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 90,000,000		$ 0