Debt - Schedule of Short-Term Borrowings and Long Term Debt (Details) - USD ($)	Dec. 31, 2019	Sep. 30, 2019
Debt Instrument [Line Items]
Other	$ (8,000,000)	$ (8,000,000)
Total debt	1,342,000,000	1,342,000,000
Current portion of long-term debt	22,000,000	15,000,000
Long-term debt	1,320,000,000	1,327,000,000
Debt issuance cost discounts	9,000,000	9,000,000
Debt acquired through acquisitions	1,000,000	1,000,000
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 Loan \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Debt gross	575,000,000	575,000,000
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	0	0
Original principal amount of debt		$ 175,000,000
Total borrowing capacity remaining	$ 130,000,000

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.

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(1)
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- Definition

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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- Definition

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

+ References

No definition available.

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- Definition

Maximum borrowing capacity under the credit facility without consideration of any current restrictions on the amount that could be borrowed or the amounts currently outstanding under the facility.

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Amount of borrowing capacity currently available under the credit facility (current borrowing capacity less the amount of borrowings outstanding).

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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.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 470
-SubTopic 20
-Section 50
-Paragraph 4
-Subparagraph (b)(3)
-URI http://asc.fasb.org/extlink&oid=109500613&loc=SL6031897-161870

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- Definition

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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