Consolidated Statements of Shareholder's Equity and Redeemable Noncontrolling Interests - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Accumulated Other Comprehensive Loss	Treasury Stock	Noncontrolling Interests
Balance at the beginning of the period at Dec. 29, 2019	$ 2,995.5	$ 110.1	$ 2,275.7	$ 4,354.6	$ (184.2)	$ (3,560.7)	$ 0.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling interests related to acquisition of Entertainment One Ltd.	39.9						39.9
Net earnings (loss) attributable to Hasbro, Inc.	(69.7)			(69.7)
Net earnings (loss) attributable to noncontrolling interests	1.8						1.8
Other comprehensive loss	(110.6)				(110.6)
Stock-based compensation transactions	(3.6)		(4.0)			0.4
Stock-based compensation expense	10.7		10.7
Dividends declared	(93.1)			(93.1)
Distributions paid to noncontrolling owners and other foreign exchange	(6.4)						(6.4)
Balance at the end of the period at Mar. 29, 2020	2,764.5	110.1	2,282.4	4,191.8	(294.8)	(3,560.3)	35.3
Beginning balance at Dec. 29, 2019	0.0
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling interests related to acquisition of Entertainment One Ltd.	23.6
Distributions paid to noncontrolling owners and other foreign exchange	2.4
Ending balance at Mar. 29, 2020	26.0
Balance at the beginning of the period at Dec. 27, 2020	2,936.7	110.1	2,329.1	4,204.2	(195.0)	(3,551.7)	40.0
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Hasbro, Inc.	116.2			116.2
Net earnings (loss) attributable to noncontrolling interests	1.3						1.3
Other comprehensive loss	(11.4)				(11.4)
Stock-based compensation transactions	(4.7)		(5.8)			1.1
Stock-based compensation expense	16.7		16.7
Dividends declared	(93.6)			(93.6)
Distributions paid to noncontrolling owners and other foreign exchange	(1.3)		(0.4)				(0.9)
Balance at the end of the period at Mar. 28, 2021	2,959.9	$ 110.1	$ 2,339.6	$ 4,226.8	$ (206.4)	$ (3,550.6)	$ 40.4
Beginning balance at Dec. 27, 2020	24.4
Increase (Decrease) in Temporary Equity [Roll Forward]
Distributions paid to noncontrolling owners and other foreign exchange	(0.4)
Ending balance at Mar. 28, 2021	$ 24.0