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Debt - March 2018 Senior Term Loan Credit Agreement Amendment (Details) - Acquisition Corp. - USD ($)	Sep. 30, 2020	Aug. 12, 2020	Sep. 30, 2019	Mar. 14, 2018
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 3,127,000,000		$ 2,998,000,000
March Two Thousand Eighteen Senior Term Loan Credit Agreement Amendment
Debt Instrument [Line Items]
Face or principal amount of debt instrument				$ 320,000,000
3.000% Senior Secured Notes due 2031
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 550,000,000	$ 550,000,000
Interest rate	3.00%	3.00%	3.00%
Senior Term Loan Facility
Debt Instrument [Line Items]
Face or principal amount of debt instrument	$ 820,000,000		$ 1,326,000,000

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

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 30
-Section 45
-Paragraph 2
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Contractual interest rate for funds borrowed, under the debt agreement.

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-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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