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 attributable to Hasbro, Inc.	117.3			117.3
Net earnings (loss) attributable to noncontrolling interests	2.1						2.1
Other comprehensive earnings (loss)	(96.1)				(96.1)
Stock-based compensation transactions	(4.1)		(4.6)			0.5
Buyout of noncontrolling interest	0.6		0.6
Stock-based compensation expense	40.0		39.7			0.3
Dividends declared	(279.5)			(279.5)
Distributions paid to noncontrolling owners and other foreign exchange	(5.9)						(5.9)
Ending balance at Sep. 27, 2020	2,808.4	110.1	2,311.4	4,192.4	(280.3)	(3,559.9)	34.7
Beginning balance at Dec. 29, 2019	0.0
Increase (Decrease) in Temporary Equity [Roll Forward]
Noncontrolling interests related to acquisition of Entertainment One Ltd.	26.2
Net earnings (loss) attributable to noncontrolling interests	(0.1)
Distributions paid to noncontrolling owners and other foreign exchange	(3.2)
Ending balance at Sep. 27, 2020	22.9
Beginning balance at Jun. 28, 2020	2,642.1	110.1	2,297.3	4,064.7	(308.1)	(3,560.0)	38.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Hasbro, Inc.	220.9			220.9
Net earnings (loss) attributable to noncontrolling interests	(0.9)						(0.9)
Other comprehensive earnings (loss)	27.8				27.8
Stock-based compensation transactions	(0.3)		(0.3)			0.1
Buyout of noncontrolling interest	0.6		0.6
Stock-based compensation expense	13.9		13.9
Dividends declared	(93.2)			(93.2)
Distributions paid to noncontrolling owners and other foreign exchange	(2.6)						(2.6)
Ending balance at Sep. 27, 2020	2,808.4	110.1	2,311.4	4,192.4	(280.3)	(3,559.9)	34.7
Beginning balance at Jun. 28, 2020	24.1
Increase (Decrease) in Temporary Equity [Roll Forward]
Distributions paid to noncontrolling owners and other foreign exchange	(1.2)
Ending balance at Sep. 27, 2020	22.9
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 attributable to Hasbro, Inc.	346.5			346.5
Net earnings (loss) attributable to noncontrolling interests	2.4						2.4
Other comprehensive earnings (loss)	(13.6)				(13.6)
Stock-based compensation transactions	13.8		4.2			9.6
Stock-based compensation expense	56.2		55.1			1.1
Dividends declared	(281.1)			(281.1)
Distributions paid to noncontrolling owners and other foreign exchange	(3.7)		0.5				(4.2)
Ending balance at Sep. 26, 2021	3,057.2	110.1	2,388.9	4,269.6	(208.6)	(3,541.0)	38.2
Beginning balance at Dec. 27, 2020	24.4
Increase (Decrease) in Temporary Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	1.6
Distributions paid to noncontrolling owners and other foreign exchange	(3.1)
Ending balance at Sep. 26, 2021	22.9
Beginning balance at Jun. 27, 2021	2,890.4	110.1	2,361.2	4,110.3	(183.5)	(3,547.6)	39.9
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings attributable to Hasbro, Inc.	253.2			253.2
Net earnings (loss) attributable to noncontrolling interests	0.4						0.4
Other comprehensive earnings (loss)	(25.1)				(25.1)
Stock-based compensation transactions	14.0		7.4			6.6
Stock-based compensation expense	19.1		19.1
Dividends declared	(93.9)			(93.9)
Distributions paid to noncontrolling owners and other foreign exchange	(0.9)		1.2				(2.1)
Ending balance at Sep. 26, 2021	3,057.2	$ 110.1	$ 2,388.9	$ 4,269.6	$ (208.6)	$ (3,541.0)	$ 38.2
Beginning balance at Jun. 27, 2021	24.5
Increase (Decrease) in Temporary Equity [Roll Forward]
Net earnings (loss) attributable to noncontrolling interests	1.3
Distributions paid to noncontrolling owners and other foreign exchange	(2.9)
Ending balance at Sep. 26, 2021	$ 22.9