Summary of Significant Accounting Policies - Schedule of Earnings per Share, Basic and Diluted (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Dec. 26, 2021	Dec. 27, 2020	Dec. 29, 2019
Basic
Net earnings attributable to Hasbro, Inc., basic	$ 428.7	$ 222.5	$ 520.5
Average shares outstanding, basic (in shares)	138.0	137.3	127.9
Net earnings attributable to Hasbro, Inc. (in dollars per share)	$ 3.11	$ 1.62	$ 4.07
Diluted
Net earnings attributable to Hasbro, Inc., diluted	$ 428.7	$ 222.5	$ 520.5
Effect of dilutive securities:
Average shares outstanding, basic (in shares)	138.0	137.3	127.9
Options and other share-based awards (in shares)	0.4	0.3	0.6
Equivalent shares, diluted (in shares)	138.4	137.6	128.5
Net earnings attributable to Hasbro, Inc. (in dollars per share)	$ 3.10	$ 1.62	$ 4.05