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Debt - Long-term Debt Footnote (Detail)	Jul. 14, 2020 USD ($)	Jun. 30, 2020 USD ($)	Jun. 30, 2020 EUR (€)	Oct. 12, 2018 EUR (€)	Jun. 30, 2020 EUR (€)	Jun. 16, 2020	Apr. 03, 2020 USD ($)	Apr. 02, 2020 USD ($)	Sep. 30, 2019 USD ($)	Sep. 30, 2019 EUR (€)	Jun. 30, 2019	Apr. 30, 2019 EUR (€)	Oct. 09, 2018 USD ($)	Oct. 09, 2018 EUR (€)
4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate		4.125%			4.125%						4.125%
4.875% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Interest rate		4.875%			4.875%						4.875%
3.625% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Interest rate		3.625%			3.625%						3.625%
Revolving Credit Facility
Debt Instrument [Line Items]
Maximum commitments under the facility							$ 300,000,000	$ 180,000,000
Acquisition Corp.
Debt Instrument [Line Items]
Face or principal amount of debt instrument		$ 3,019,000,000.000							$ 2,998,000,000
Unamortized discount		3,000,000							3,000,000
Unamortized deferred financing costs		23,000,000							29,000,000
Unamortized premium		7,000,000							8,000,000
Acquisition Corp. | Senior Term Loan Facility due 2023
Debt Instrument [Line Items]
Face or principal amount of debt instrument		1,326,000,000							1,326,000,000
Unamortized discount		3,000,000							3,000,000
Unamortized deferred financing costs		8,000,000							10,000,000
Acquisition Corp. | 5.000% Senior Secured Notes due 2023
Debt Instrument [Line Items]
Face or principal amount of debt instrument		300,000,000							300,000,000
Unamortized deferred financing costs		$ 2,000,000							2,000,000
Interest rate		5.00%			5.00%	5.00%
Redemptions of senior notes		$ 244,000,000
Acquisition Corp. | 5.000% Senior Secured Notes due 2023 | Subsequent Event
Debt Instrument [Line Items]
Redemptions of senior notes	$ 295,000
Acquisition Corp. | 4.125% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Face or principal amount of debt instrument		349,000,000			€ 311,000,000				340,000,000	€ 311,000,000
Unamortized deferred financing costs		$ 3,000,000							4,000,000
Interest rate		4.125%		4.125%	4.125%								4.125%	4.125%
Redemptions of senior notes | €			€ 311,000,000	€ 34,500,000
Acquisition Corp. | 4.875% Senior Secured Notes due 2024
Debt Instrument [Line Items]
Face or principal amount of debt instrument		$ 220,000,000							220,000,000				$ 30,000,000
Unamortized deferred financing costs		$ 2,000,000							2,000,000
Interest rate		4.875%			4.875%								4.875%	4.875%
Redemptions of senior notes		$ 220,000,000
Acquisition Corp. | 3.625% Senior Secured Notes due 2026
Debt Instrument [Line Items]
Face or principal amount of debt instrument		499,000,000			€ 445,000,000				487,000,000	€ 445,000,000		€ 195,000,000		€ 250,000,000
Unamortized deferred financing costs		$ 5,000,000							5,000,000
Interest rate		3.625%			3.625%							3.625%	3.625%	3.625%
Unamortized premium		$ 7,000,000							7,000,000
Acquisition Corp. | 5.500% Senior Notes due 2026
Debt Instrument [Line Items]
Face or principal amount of debt instrument		325,000,000							325,000,000
Unamortized deferred financing costs		$ 3,000,000							3,000,000
Interest rate		5.50%			5.50%
Acquisition Corp. | Revolving Credit Facility
Debt Instrument [Line Items]
Commitments under revolving credit facility		$ 300,000,000							300,000,000
Letters of credit outstanding		13,000,000							13,000,000
Revolving credit facility outstanding		$ 0							$ 0

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

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