Earnings (Loss) Per Common Share - Net (Loss) Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended						9 Months Ended
	Sep. 28, 2025	Jun. 29, 2025	Mar. 30, 2025	Sep. 29, 2024	Jun. 30, 2024	Mar. 31, 2024	Sep. 28, 2025	Sep. 29, 2024
Earnings Per Share [Abstract]
Net earnings (loss) attributable to Hasbro, Inc.	$ 233.2	$ (855.8)	$ 98.6	$ 223.2	$ 138.5	$ 58.2	$ (524.0)	$ 419.9
Average shares outstanding, basic (in shares)	140.4			139.5			140.1	139.3
Options and other share-based awards (in shares)	1.8			1.0			0.0	0.7
Equivalent shares, diluted (in shares)	142.2			140.5			140.1	140.0
Net earnings (loss) attributable to Hasbro, Inc. per common share
Net earnings (loss) attributable to Hasbro, Inc. per common share, basic (in dollars per share)	$ 1.66			$ 1.60			$ (3.74)	$ 3.01
Net earnings (loss) attributable to Hasbro, Inc. per common share, diluted (in dollars per share)	$ 1.64			$ 1.59			$ (3.74)	$ 3.00