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Debt - Narrative (Details)	1 Months Ended			3 Months Ended	12 Months Ended
Debt - Narrative (Details)	Dec. 31, 2017 USD ($)	Aug. 31, 2017 USD ($)	Jul. 31, 2016 USD ($)	Dec. 31, 2016 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2017 USD ($)	Sep. 30, 2016 USD ($)	Aug. 02, 2018 USD ($)	Nov. 20, 2017 USD ($)	Nov. 30, 2016 USD ($)
Debt Instrument [Line Items]
Proceeds from borrowings, net of issuance costs					$ 304,000,000	$ 470,000,000	$ 1,372,000,000
Amount outstanding					1,333,000,000
Quarterly installments due in fiscal 2019					30,000,000
Quarterly installments due in fiscal 2020					30,000,000
Quarterly installments due in fiscal 2021					497,000,000
Repayments on borrowings					108,000,000	90,000,000	$ 637,000,000
Outstanding balance of short-term debt					0	75,000,000
Revolver
Debt Instrument [Line Items]
Borrowings from revolving facility					204,000,000
Repayments towards revolving facility					57,000,000
Remaining borrowing capacity					293,000,000
Letter of Credit
Debt Instrument [Line Items]
Letters of credit outstanding								$ 10,000,000
IPO
Debt Instrument [Line Items]
Proceeds from initial public offering used to repay outstanding debt	$ 0
Line of Credit \| Revolver
Debt Instrument [Line Items]
Outstanding amount under revolver					147,000,000	0
2025 Notes \| Senior Notes
Debt Instrument [Line Items]
Interest rate of debt		4.375%
Aggregate principal amount		$ 400,000,000
Proceeds from borrowings, net of issuance costs		$ 394,000,000
Amount outstanding					400,000,000	400,000,000
2024 Notes \| Senior Notes
Debt Instrument [Line Items]
Interest rate of debt			5.50%
Aggregate principal amount			$ 375,000,000
Proceeds from borrowings, net of issuance costs			$ 370,000,000
Amount outstanding					375,000,000	375,000,000
2016 Credit Facilities
Debt Instrument [Line Items]
Principal amount of line of credit					$ 1,325,000,000
Maximum consolidated leverage ratio					4.5
Minimum consolidated interest coverage ratio					3.0
2016 Credit Facilities \| Minimum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.50%
2016 Credit Facilities \| Minimum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					0.50%
2016 Credit Facilities \| Maximum \| London Interbank Offered Rate (LIBOR)
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					2.50%
2016 Credit Facilities \| Maximum \| Base Rate
Debt Instrument [Line Items]
Debt instrument, basis spread on variable rate					1.50%
2016 Credit Facilities \| Line of Credit \| Revolver
Debt Instrument [Line Items]
Principal amount of line of credit					$ 450,000,000
Term of debt					5 years
2016 Credit Facilities \| Line of Credit \| Letter of Credit
Debt Instrument [Line Items]
Principal amount of line of credit					$ 100,000,000
Term Loans \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Principal amount of line of credit					$ 875,000,000
Term of debt					5 years
Amount outstanding					$ 270,000,000	285,000,000
Quarterly installments due in fiscal 2019					8,000,000
Quarterly installments due in fiscal 2020					8,000,000
Quarterly installments due in fiscal 2021					$ 15,000,000
Trade Receivables Facility \| Secured Debt
Debt Instrument [Line Items]
Principal amount of line of credit									$ 175,000,000	$ 125,000,000
Term of debt					1 year
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Proceeds from borrowings, net of issuance costs				$ 75,000,000
Outstanding balance of short-term debt						75,000,000
Trade Receivables Facility \| Line of Credit \| Secured Debt
Debt Instrument [Line Items]
Proceeds from borrowings, net of issuance costs					$ 101,000,000
Outstanding amount under revolver					140,000,000
Repayments on borrowings					36,000,000
Outstanding balance of short-term debt						$ 75,000,000
Remaining borrowing capacity					$ 35,000,000
Weighted-average interest rate					2.80%	1.80%
Trade Receivables Facility \| Line of Credit \| Secured Debt \| Financing Subsidiary
Debt Instrument [Line Items]
Accounts receivable pledged as collateral					$ 275,000,000	$ 247,000,000