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
Beginning balance 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.	38.6						38.6
Net earnings (loss) attributable to Hasbro, Inc.	(103.6)			(103.6)
Net earnings (loss) attributable to noncontrolling interests	3.0						3.0
Other comprehensive earnings (loss)	(123.9)				(123.9)
Stock-based compensation transactions	(3.8)		(4.2)			0.4
Stock-based compensation expense	26.1		25.8			0.3
Dividends declared	(186.2)			(186.2)
Distributions paid to noncontrolling owners and other foreign exchange	(3.5)						(3.5)
Ending balance at Jun. 28, 2020	2,642.2	110.1	2,297.3	4,064.8	(308.1)	(3,560.0)	38.1
Beginning balance at Dec. 29, 2019	0.0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	(0.1)
Noncontrolling interests related to acquisition of Entertainment One Ltd.	26.2
Distributions paid to noncontrolling owners and other foreign exchange	(2.0)
Ending balance at Jun. 28, 2020	24.1
Beginning balance at Mar. 29, 2020	2,764.5	110.1	2,282.4	4,191.8	(294.8)	(3,560.3)	35.3
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Noncontrolling interests related to acquisition of Entertainment One Ltd.	(1.4)						(1.4)
Net earnings (loss) attributable to Hasbro, Inc.	(33.9)			(33.9)
Net earnings (loss) attributable to noncontrolling interests	1.0						1.0
Other comprehensive earnings (loss)	(13.3)				(13.3)
Stock-based compensation transactions	(0.3)		(0.3)
Stock-based compensation expense	15.5		15.2			0.3
Dividends declared	(93.1)			(93.1)
Distributions paid to noncontrolling owners and other foreign exchange	3.2						3.2
Ending balance at Jun. 28, 2020	2,642.2	110.1	2,297.3	4,064.8	(308.1)	(3,560.0)	38.1
Beginning balance at Mar. 29, 2020	26.0
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling interests related to acquisition of Entertainment One Ltd.	2.6
Distributions paid to noncontrolling owners and other foreign exchange	(4.5)
Ending balance at Jun. 28, 2020	24.1
Beginning balance 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.	93.3			93.3
Net earnings (loss) attributable to noncontrolling interests	2.0						2.0
Other comprehensive earnings (loss)	11.5				11.5
Stock-based compensation transactions	(0.2)		(3.2)			3.0
Stock-based compensation expense	37.1		36.0			1.1
Dividends declared	(187.2)			(187.2)
Distributions paid to noncontrolling owners and other foreign exchange	(2.8)		(0.7)				(2.1)
Ending balance at Jun. 27, 2021	2,890.4	110.1	2,361.2	4,110.3	(183.5)	(3,547.6)	39.9
Beginning balance at Dec. 27, 2020	24.4
Increase (Decrease) in Temporary Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	0.3
Distributions paid to noncontrolling owners and other foreign exchange	(0.2)
Ending balance at Jun. 27, 2021	24.5
Beginning balance at Mar. 28, 2021	2,959.9	110.1	2,339.6	4,226.8	(206.4)	(3,550.6)	40.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings (loss) attributable to Hasbro, Inc.	(22.9)			(22.9)
Net earnings (loss) attributable to noncontrolling interests	0.7						0.7
Other comprehensive earnings (loss)	22.9				22.9
Stock-based compensation transactions	4.5		2.6			1.9
Stock-based compensation expense	20.4		19.3			1.1
Dividends declared	(93.6)			(93.6)
Distributions paid to noncontrolling owners and other foreign exchange	(1.5)		(0.3)				(1.2)
Ending balance at Jun. 27, 2021	2,890.4	$ 110.1	$ 2,361.2	$ 4,110.3	$ (183.5)	$ (3,547.6)	$ 39.9
Beginning balance at Mar. 28, 2021	24.0
Increase (Decrease) in Temporary Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	0.3
Distributions paid to noncontrolling owners and other foreign exchange	0.2
Ending balance at Jun. 27, 2021	$ 24.5