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Debt - 3.625% Senior Secured Notes Offerings (Details)					12 Months Ended
	Nov. 05, 2018 USD ($)	Oct. 12, 2018 EUR (€)	Oct. 09, 2018 USD ($)	Oct. 09, 2018 EUR (€)	Sep. 30, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2018 USD ($)	Sep. 30, 2020 EUR (€)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 EUR (€)	Jun. 29, 2020 USD ($)	Jun. 29, 2020 EUR (€)	Sep. 30, 2019 EUR (€)	Apr. 30, 2019 EUR (€)	Oct. 09, 2018 EUR (€)
Debt Instrument [Line Items]
Redemptions of senior notes					$ 0	$ 0	$ 635,000,000
Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument					$ 3,127,000,000	$ 2,998,000,000
3.625% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate					3.625%	3.625%	3.625%	3.625%					3.625%
3.625% Senior Secured Notes | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate		3.625%	3.625%		3.625%			3.625%						3.625%	3.625%
Face or principal amount of debt instrument					$ 519,000,000	$ 487,000,000		€ 445,000,000					€ 445,000,000	€ 195,000,000	€ 250,000,000
4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate					4.125%	4.125%	4.125%	4.125%					4.125%
4.125% Senior Secured Notes due 2024 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate		4.125%	4.125%		4.125%			4.125%	4.125%	4.125%	4.125%	4.125%			4.125%
Face or principal amount of debt instrument | €										€ 311,000,000		€ 311,000,000
Redemptions of senior notes | €		€ 34,500,000		€ 34,500,000
4.875% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate					4.875%	4.875%	4.875%	4.875%					4.875%
4.875% Senior Secured Notes | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate			4.875%		4.875%			4.875%	4.875%	4.875%	4.875%	4.875%			4.875%
Face or principal amount of debt instrument			$ 30,000,000						$ 220,000,000		$ 220,000,000
5.625% Senior Secured Notes
Debt Instrument [Line Items]
Interest rate					5.625%	5.625%	5.625%	5.625%					5.625%
5.625% Senior Secured Notes | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	5.625%		5.625%											5.625%	5.625%
Redemptions of senior notes	$ 26,550,000		$ 26,550,000

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Face (par) amount of debt instrument at time of issuance.

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