Debt Obligations - Schedule of Short-Term Borrowings and Long Term Debt (Details) - USD ($)	Mar. 31, 2018	Sep. 30, 2017
Debt Instrument [Line Items]
Short-term debt	$ 0	$ 75,000,000
Other	(10,000,000)	(11,000,000)
Total debt	1,206,000,000	1,124,000,000
Current portion of long-term debt	23,000,000	15,000,000
Long-term debt	1,183,000,000	1,034,000,000
Debt issuance cost discounts	12,000,000	13,000,000
Debt acquired through acquisitions	2,000,000	2,000,000
Line of Credit \| Revolver
Debt Instrument [Line Items]
Short-term debt	0	0
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	278,000,000	285,000,000
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Long-term debt	163,000,000
Line of Credit \| Revolver
Debt Instrument [Line Items]
Short-term debt	$ 0	0
Line of Credit \| Trade Receivables Facility \| Secured Debt
Debt Instrument [Line Items]
Short-term debt		$ 75,000,000

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/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.5-02(22))
-URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682

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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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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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-URI http://asc.fasb.org/extlink&oid=6879938&loc=d3e572229-122910

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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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Reflects the total carrying amount as of the balance sheet date of debt having initial terms less than one year or the normal operating cycle, if longer.

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

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