Revenue Recognition - Net Revenues by Brand Portfolio (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 29, 2024	Dec. 31, 2023	Dec. 25, 2022
Revenue from External Customer [Line Items]
Net revenues	$ 4,745.9	$ 5,710.6	$ 6,666.5
Net revenues	4,135.5	5,003.3	5,856.7
Franchise Brands
Revenue from External Customer [Line Items]
Net revenues	3,120.9	3,256.5	3,350.8
Partner Brands
Revenue from External Customer [Line Items]
Net revenues	583.4	687.8	1,052.0
Portfolio Brands
Revenue from External Customer [Line Items]
Net revenues	431.2	521.8	625.2
Non-Hasbro Branded Film & TV
Revenue from External Customer [Line Items]
Net revenues	$ 0.0	$ 537.2	$ 828.7