Earnings (Loss) Per Share - Net Earnings (Loss) Per Share (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2024	Jul. 02, 2023	Jun. 30, 2024	Jul. 02, 2023
Earnings Per Share [Abstract]
Net earnings (loss) attributable to Hasbro, Inc.	$ 138.5	$ (235.0)	$ 196.7	$ (257.1)
Average shares outstanding, basic (in shares)	139.5	138.8	139.2	138.7
Options and other share-based awards (in shares)	0.5	0.0	0.4	0.0
Equivalent shares, diluted (in shares)	140.0	138.8	139.6	138.7
Net earnings (loss) attributable to Hasbro, Inc. per common share, basic (in dollars per share)	$ 0.99	$ (1.69)	$ 1.41	$ (1.85)
Net earnings (loss) attributable to Hasbro, Inc. per common share, diluted (in dollars per share)	$ 0.99	$ (1.69)	$ 1.41	$ (1.85)