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Acquisitions and Divestitures - Divestiture (Details) £ in Millions, $ in Millions			6 Months Ended
	Jun. 19, 2020 GBP (£)	Jun. 19, 2020 USD ($)	Jun. 27, 2020 USD ($)	Jun. 29, 2019 USD ($)
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of business			$ 187.8	$ 0.0
Gain on sale of business			$ (17.4)	$ 0.0
CSCI \| Rosemont Pharmaceuticals
Income Statement, Balance Sheet and Additional Disclosures by Disposal Groups, Including Discontinued Operations [Line Items]
Net proceeds from sale of business	£ 155.6	$ 195.0
Gain on sale of business		(17.4)
Gain related to write off of assets sold		29.0
Cash sold		7.5
Foreign currency translation adjustment		$ (46.4)