Consolidated Statements of Comprehensive Earnings - USD ($) $ in Millions	3 Months Ended
	Mar. 28, 2021	Mar. 29, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 117.5	$ (67.9)
Other comprehensive earnings (losses):
Foreign currency translation adjustments, net of tax	(16.1)	(131.8)
Unrealized holding losses on available-for-sale securities, net of tax	0.0	(0.4)
Net gains on cash flow hedging activities, net of tax	5.6	25.0
Reclassifications to earnings, net of tax:
Net gains on cash flow hedging activities	(1.1)	(3.7)
Amortization of unrecognized pension and postretirement amounts	0.2	0.3
Total other comprehensive loss, net of tax	(11.4)	(110.6)
Total comprehensive earnings attributable to noncontrolling interests	1.3	1.8
Total comprehensive earnings (loss) attributable to Hasbro, Inc.	$ 104.8	$ (180.3)