Discontinued Operations (Details) $ in Millions					3 Months Ended
	Jul. 06, 2021 USD ($)	Mar. 08, 2021 USD ($)	Dec. 31, 2020 USD ($)	May 15, 2015 brand	Apr. 02, 2022 USD ($)	Apr. 03, 2021 USD ($)
Discontinued Operations
Gain on sale of business					$ (1.4)	$ 0.0
Foreign currency translation gain	$ 159.3
Purchase of inventory					10.5	83.2
Number of ANDAs acquired | brand				2
Prepaid expenses and other current assets
Discontinued Operations
Receivable from transition services agreement					14.8
Discontinued Operations | Discontinued Operations, Disposed of by Sale
Discontinued Operations
Total consideration	1,550.0
Potential R&D milestone payments and contingent purchase obligations assumed by purchaser	53.3
Gain on sale of business	$ 47.5
Transition service period	24 months
Supply agreement term	4 years
Supply agreement, extension period	7 years
Proceeds from transition services agreement					3.4
Proceeds from supply and distribution agreements					30.7
Payments for supply arrangements					14.3
Aggregate cap on buyer's obligation for certain pre-closing liabilities (percent)	5000.00%
Aggregate cap on buyer's obligation for certain pre-closing liabilities	$ 50.0
Income (loss) from discontinued operations, net of tax					(1.1)	35.3
Separation costs						9.3
Asset acquisitions		$ 53.3	$ 16.4			$ 69.7
Discontinued Operations | Discontinued Operations, Disposed of by Sale | Other Operating Expense (Income)
Discontinued Operations
Income from transition services agreement					3.4
Discontinued Operations | Discontinued Operations, Disposed of by Sale | Net Sales
Discontinued Operations
Product sales and royalty income from transition services agreement					32.8
RX Business | Discontinued Operations, Disposed of by Sale | Discontinued Operations
Discontinued Operations
Purchase of inventory					$ 8.7