Debt - Schedule of Long Term Debt (Details) - USD ($)	Sep. 30, 2019	Sep. 30, 2018
Debt Instrument [Line Items]
Debt gross	$ 1,351,000,000
Other	(8,000,000)	$ (10,000,000)
Total debt	1,342,000,000	1,322,000,000
Current portion of long-term debt	15,000,000	30,000,000
Long-term debt	1,327,000,000	1,292,000,000
Debt issuance cost discounts	9,000,000	11,000,000
Debt acquired through acquisitions	1,000,000	1,000,000
Line of Credit \| Revolver
Debt Instrument [Line Items]
Long-term debt	0	147,000,000
2025 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt gross	400,000,000	400,000,000
2024 Notes \| Senior Notes
Debt Instrument [Line Items]
Debt gross	375,000,000	375,000,000
Term Loans \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt gross	575,000,000	270,000,000
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	$ 0	$ 140,000,000

Amount, before unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but is not limited to, notes payable, bonds payable, commercial loans, mortgage loans, convertible debt, subordinated debt and other types of debt.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of unamortized debt discount (premium) and debt issuance costs.

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Represents the aggregate of total long-term debt, including current maturities and short-term debt.

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No definition available.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount, after unamortized (discount) premium and debt issuance costs, of long-term debt, classified as current. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount after unamortized (discount) premium and debt issuance costs of long-term debt classified as noncurrent and excluding amounts to be repaid within one year or the normal operating cycle, if longer. Includes, but not limited to, notes payable, bonds payable, debentures, mortgage loans and commercial paper. Excludes capital lease obligations.

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Amount of long-term debt classified as other.

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Debt Instrument, Unamortized Discount (Premium) and Debt Issuance Costs, Net, and Other Long-term Debt

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