Business Combination - Summary of Assets Acquired and Liabilities Assumed (Details) - USD ($) $ in Thousands	Mar. 31, 2026	Mar. 02, 2026	Dec. 31, 2025	Mar. 31, 2025
Business Combination [Line Items]
Goodwill	$ 1,583,942		$ 1,390,169	$ 1,385,063
Mattel163 Limited
Business Combination [Line Items]
Cash and equivalents		$ 87,852
Accounts receivable, net of allowances for credit losses		22,510
Other tangible assets		37,926
Identifiable intangible assets, net		161,190
Accounts payable and other current liabilities		(37,411)
Deferred income		(48,439)
Other noncurrent liabilities		(62,256)
Total identifiable net assets		161,372
Goodwill		$ 195,820