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Debt - 3.875% Senior Secured Notes and 2.750% Senior Secured Notes Offerings (Details)				12 Months Ended
	Jul. 14, 2020 USD ($)	Oct. 12, 2018 EUR (€)	Oct. 09, 2018 EUR (€)	Sep. 30, 2020 USD ($)	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 (€)	Jun. 16, 2020	Oct. 09, 2018 USD ($)
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
3.875% Senior Secured Notes due 2030 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate				3.875%			3.875%	3.875%	3.875%	3.875%	3.875%
Face or principal amount of debt instrument				$ 535,000,000						$ 535,000,000
2.750% Senior Secured Notes due 2028 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate				2.75%			2.75%	2.75%	2.75%	2.75%	2.75%
Face or principal amount of debt instrument				$ 379,000,000			€ 325,000,000				€ 325,000,000
4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate				4.125%	4.125%	4.125%	4.125%
4.125% 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%
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% 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%
Face or principal amount of debt instrument								$ 220,000,000		$ 220,000,000			$ 30,000,000
5.000% Senior Secured Notes due 2023 | Acquisition Corp.
Debt Instrument [Line Items]
Interest rate	5.00%			5.00%			5.00%	5.00%	5.00%	5.00%	5.00%	5.00%
Face or principal amount of debt instrument	$ 244,000,000							$ 244,000,000		$ 244,000,000
Redemptions of senior notes	$ 295,000,000

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