Revenue from Contracts with Customers (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 26, 2021		Mar. 27, 2020	Dec. 25, 2020	Dec. 27, 2019
Disaggregation of Revenue [Line Items]
Revenue Reserves	$ 294.3		$ 291.9	$ 235.4	$ 337.4
Revenue Reserve Provision	526.7		475.3
Revenue Reserve Payments or Credits	(467.8)		(520.8)
Change in Product Returns provision	21.9
Capitalized Contract Cost, Gross	27.0			25.8
Capitalized Contract Cost, Amortization	1.4		1.5
Net sales	$ 558.0		$ 665.8
Transferred at Point in Time [Member]
Disaggregation of Revenue [Line Items]
Revenue	75.70%		78.50%
Transferred over Time [Member]
Disaggregation of Revenue [Line Items]
Revenue	24.30%		21.50%
Royalty [Member]
Disaggregation of Revenue [Line Items]
Net sales	$ 35.4		$ 15.6
Rebates and Chargebacks [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	241.6		254.8	196.5	295.8
Revenue Reserve Provision	488.0		457.8
Revenue Reserve Payments or Credits	(442.9)		(498.8)
Allowance for Sales Returns [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	42.3		26.1	26.6	28.4
Revenue Reserve Provision	25.7	[1]	3.8
Revenue Reserve Payments or Credits	(10.0)		(6.1)
Other Sales Deductions [Member]
Disaggregation of Revenue [Line Items]
Revenue Reserves	10.4		11.0	$ 12.3	$ 13.2
Revenue Reserve Provision	13.0		13.7
Revenue Reserve Payments or Credits	$ (14.9)		$ (15.9)
Minimum
Disaggregation of Revenue [Line Items]
Royalty Rate Percentage	18.00%
Maximum
Disaggregation of Revenue [Line Items]
Royalty Rate Percentage	26.00%

[1] Provisions for returns increased by $21.9 million driven by the Specialty Brands segment primarily related to a discrete return of product sold during the three months ended March 26, 2021.