Earnings (Loss) Per Share - Schedule of Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2023	Sep. 25, 2022	Oct. 01, 2023	Sep. 25, 2022
Basic
Net (loss) earnings attributable to Hasbro, Inc.	$ (171.1)	$ 129.2	$ (428.2)	$ 332.4
Average shares outstanding, basic (in shares)	138.8	138.3	138.7	138.9
Net earnings (loss) per common share, basic (in dollars per share)	$ (1.23)	$ 0.93	$ (3.09)	$ 2.39
Diluted
Net (loss) earnings attributable to Hasbro, Inc.	$ (171.1)	$ 129.2	$ (428.2)	$ 332.4
Average shares outstanding, diluted (in shares)	138.8	138.3	138.7	138.9
Effect of dilutive securities:
Options and other share-based awards (in shares)	0.0	0.2	0.0	0.2
Equivalent shares, diluted (in shares)	138.8	138.5	138.7	139.1
Net earnings (loss) per common share, diluted (in dollars per share)	$ (1.23)	$ 0.93	$ (3.09)	$ 2.39