Consolidated Statements of Comprehensive Earnings - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 25, 2022	Dec. 26, 2021
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ (1,487.8)	$ 203.0	$ 435.3
Other comprehensive earnings (loss):
Foreign currency translation adjustments, net of tax	59.4	(45.4)	(61.9)
Unrealized holding losses on available-for-sale securities, net of tax	0.0	(0.3)	(0.1)
Net (losses) gains on cash flow hedging activities, net of tax	(8.6)	10.2	13.5
Changes in unrecognized pension amounts, net of tax	(0.9)	30.8	3.4
Reclassifications to earnings, net of tax:
Net losses (gains) on cash flow hedging activities	3.8	(16.2)	2.6
Amortization of unrecognized pension and postretirement amounts	(0.3)	1.3	2.2
Other comprehensive earnings (loss), net of tax	53.4	(19.6)	(40.3)
Total comprehensive earnings (loss), net of tax	(1,434.4)	183.4	395.0
Total comprehensive earnings (loss) attributable to noncontrolling interests	1.5	(0.5)	6.6
Total comprehensive earnings (loss) attributable to Hasbro, Inc.	$ (1,435.9)	$ 183.9	$ 388.4