Earnings Per Share - Schedule of Earnings Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 26, 2022	Jun. 27, 2021	Jun. 26, 2022	Jun. 27, 2021
Basic
Net earnings (loss) attributable to Hasbro, Inc.	$ 142.0	$ (22.9)	$ 203.2	$ 93.3
Average shares outstanding, basic (in shares)	139.0	137.8	139.2	137.8
Net earnings (loss) per common share, basic (in dollars per share)	$ 1.02	$ (0.17)	$ 1.46	$ 0.68
Diluted
Net earnings (loss) attributable to Hasbro, Inc.	$ 142.0	$ (22.9)	$ 203.2	$ 93.3
Effect of dilutive securities:
Average shares outstanding, basic (in shares)	139.0	137.8	139.2	137.8
Options and other share-based awards (in shares)	0.2	0.0	0.2	0.4
Equivalent Shares (in shares)	139.2	137.8	139.4	138.2
Net earnings per common share, diluted (in dollars per share)	$ 1.02	$ (0.17)	$ 1.46	$ 0.68