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Goodwill - Changes in Goodwill (Detail) $ in Millions	Mar. 31, 2023 USD ($)
Goodwill [Line Items]
Balance at January 1, 2022	$ 3,649.5
Balance at September 30, 2022	$ 3,649.5

Amount after accumulated impairment loss of an asset representing future economic benefits arising from other assets acquired in a business combination that are not individually identified and separately recognized.

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