Discontinued Operations (Details) - USD ($)		3 Months Ended	9 Months Ended
	Jul. 06, 2021	Oct. 02, 2021	Oct. 02, 2021	Sep. 26, 2020
Discontinued Operations
Gain on sale of business			$ 63,900,000	$ (18,600,000)
Write-off of foreign currency translation adjustment	$ (160,000,000)
Purchase of inventory			70,200,000	$ 93,200,000
Prepaid expenses and other current assets
Discontinued Operations
Receivable from transition services agreement		$ 36,400,000	36,400,000
Other Operating Expense (Income)
Discontinued Operations
Income from transition services agreement		3,600,000	3,600,000
Net Sales
Discontinued Operations
Product sales and royalty income from transition services agreement		29,400,000	29,400,000
RX Business
Discontinued Operations
Purchase of inventory		9,500,000	9,500,000
RX | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Total consideration	1,550,000,000
Potential R&D milestone payments and contingent purchase obligations assumed by purchaser	53,300,000
Gain on sale of business	$ 63,900,000
Transition service period	24 months
Supply agreement term	4 years
Supply agreement, extension period	7 years
Aggregate cap on buyer's obligation for certain pre-closing liabilities (percent)	50.00%
Aggregate cap on buyer's obligation for certain pre-closing liabilities	$ 50,000,000
Separation costs		$ 29,100,000	$ 40,800,000