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Collaboration Agreements (Ipsen Collaboration, Narrative) (Details) $ in Millions, $ in Millions	3 Months Ended								12 Months Ended
	Jan. 01, 2021 USD ($)	Oct. 02, 2020 USD ($)	Jul. 03, 2020 USD ($)	Apr. 03, 2020 USD ($)	Jan. 03, 2020 USD ($)	Sep. 27, 2019 USD ($)	Jun. 28, 2019 USD ($)	Mar. 29, 2019 USD ($)	Jan. 01, 2021 USD ($)	Jan. 03, 2020 USD ($)	Dec. 28, 2018 USD ($)	Dec. 31, 2016 USD ($)	Jan. 01, 2021 CAD ($)
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Milestone payments earned to date	$ 350.0								$ 350.0
Milestone payments earned	29.4	$ 13.5	$ 43.5	$ 0.1	$ 15.1	$ 50.6	$ 20.4	$ 10.0
Remaining performance obligation	86.1								$ 86.1
Collaborative Arrangement with GlaxoSmithKline
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration agreement percent of royalty on net sale									3.00%
Collaborative arrangement with Ipsen
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Collaboration period to achieve specified levels of commercial performance									10 years
Upfront payments												$ 210.0
Milestone payments earned									$ 20.0	$ 55.0	$ 140.0
Eligible payment from collaboration for development and regulatory milestone achievement under collaborations agreement	59.0								59.0
Maximum amount eligible for commercial milestones under collaborations agreement	450.0								450.0				$ 26.5
Remaining performance obligation	$ 41.3								$ 41.3
Research and development arrangement performed for others, reimbursement for costs incurred, percent									35.00%
Collaborative arrangement with Ipsen | Minimum | Final tier
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percent of royalty on net sale									22.00%
Collaborative arrangement with Ipsen | Maximum | Final tier
Collaborative Arrangement and Arrangement Other than Collaborative [Line Items]
Percent of royalty on net sale									26.00%

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Amount of transaction price allocated to performance obligation that has not been recognized as revenue.

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Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 606
-SubTopic 10
-Section 50
-Paragraph 13
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=121604090&loc=SL49130556-203045

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