Segment Reporting - Net Revenues by Brand and Entertainment Segment (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2023	Sep. 25, 2022	Oct. 01, 2023	Sep. 25, 2022
Revenue from External Customer [Line Items]
Net revenues	$ 1,503.4	$ 1,675.9	$ 3,714.4	$ 4,178.2
Franchise Brands
Revenue from External Customer [Line Items]
Net revenues	1,011.0	939.8	2,412.8	2,416.2
Partner Brands
Revenue from External Customer [Line Items]
Net revenues	228.2	349.9	533.8	775.8
Portfolio Brands
Revenue from External Customer [Line Items]
Net revenues	170.3	209.0	369.4	457.4
Non-Hasbro Branded Film & TV
Revenue from External Customer [Line Items]
Net revenues	93.9	177.2	398.4	528.8
Wizards of the Coast and Digital Gaming
Revenue from External Customer [Line Items]
Net revenues	423.6	303.5	1,094.4	986.1
Wizards of the Coast and Digital Gaming | Tabletop Gaming
Revenue from External Customer [Line Items]
Net revenues	290.5	246.3	806.9	800.3
Wizards of the Coast and Digital Gaming | Digital and Licensed Gaming
Revenue from External Customer [Line Items]
Net revenues	133.1	57.2	287.5	185.8
Entertainment
Revenue from External Customer [Line Items]
Net revenues	122.9	211.6	487.5	624.3
Entertainment | Film & TV
Revenue from External Customer [Line Items]
Net revenues	102.1	188.6	423.8	527.0
Entertainment | Family Brands
Revenue from External Customer [Line Items]
Net revenues	20.8	13.6	63.7	59.6
Entertainment | Music and Other
Revenue from External Customer [Line Items]
Net revenues	$ 0.0	$ 9.4	$ 0.0	$ 37.7