Segment Information - Reconciliation of Operating Profit (Loss) from Segments to Consolidated (Parenthetical) (Detail) - USD ($) $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2026	Sep. 30, 2025	Sep. 30, 2026	Sep. 30, 2025
China [Member] \| Location, Statement of Income, Balance [Axis]: us-gaap:SellingExpense
Segment Reporting [Line Items]
Independent service providers service fees costs	$ 27.6	$ 34.6	$ 85.0	$ 105.6

Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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+ Details