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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 (€)
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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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- Definition Contractual interest rate for funds borrowed, under the debt agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.22(a)(1)) -URI http://asc.fasb.org/extlink&oid=120391452&loc=d3e13212-122682 + Details
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- Definition Amount, before accumulated amortization, of debt issuance costs. Includes, but is not limited to, legal, accounting, underwriting, printing, and registration costs. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 835 -SubTopic 30 -Section 45 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=119993939&loc=d3e28555-108399 + Details
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- Definition The carrying value as of the balance sheet date of the current and noncurrent portions of long-term obligations drawn from a line of credit, which is a bank's commitment to make loans up to a specific amount. Examples of items that might be included in the application of this element may consist of letters of credit, standby letters of credit, and revolving credit arrangements, under which borrowings can be made up to a maximum amount as of any point in time conditional on satisfaction of specified terms before, as of and after the date of drawdowns on the line. Includes short-term obligations that would normally be classified as current liabilities but for which (a) postbalance sheet date issuance of a long term obligation to refinance the short term obligation on a long term basis, or (b) the enterprise has entered into a financing agreement that clearly permits the enterprise to refinance the short-term obligation on a long term basis and the following conditions are met (1) the agreement does not expire within 1 year and is not cancelable by the lender except for violation of an objectively determinable provision, (2) no violation exists at the BS date, and (3) the lender has entered into the financing agreement is expected to be financially capable of honoring the agreement. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -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=120391452&loc=d3e13212-122682 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 942 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.9-03(16)) -URI http://asc.fasb.org/extlink&oid=120398452&loc=d3e534808-122878 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 944 -SubTopic 210 -Section S99 -Paragraph 1 -Subparagraph (SX 210.7-03(16)) -URI http://asc.fasb.org/extlink&oid=120400017&loc=d3e572229-122910 + Details
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