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Acquisitions and Divestitures (Details) € in Millions, $ in Millions								3 Months Ended			9 Months Ended		12 Months Ended
	Aug. 24, 2018 USD ($)	May 29, 2018 USD ($)	Aug. 25, 2017 USD ($)	Aug. 25, 2017 EUR (€)	Apr. 06, 2017 USD ($)	Feb. 01, 2017 USD ($)	Jan. 03, 2017 USD ($)	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Jul. 01, 2017 USD ($)	Sep. 29, 2018 USD ($)	Sep. 30, 2017 USD ($)	Dec. 31, 2016 USD ($)
Business Acquisition [Line Items]
Payment to acquire intangible assets											$ 32.8	$ 0.0
Useful life (in years)	20 years
Non-refundable upfront license fee								$ 43.7	$ 38.4		174.0	120.8
Net proceeds from sale of business and other assets											$ 5.0	$ 46.7
RX
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets							$ 15.0
CHCA
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets						$ 7.7
Other
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets					$ 22.2
Impairment charge													$ 35.3
CHCI
Business Acquisition [Line Items]
Net proceeds from sale of business and other assets			$ 15.1	€ 12.7
Impairment charge										$ 3.7
Merck Sharp & Dohme License Agreement \| CHCA
Business Acquisition [Line Items]
Non-refundable upfront license fee		$ 50.0
Diclofenac Sodium Gel 3%
Business Acquisition [Line Items]
Payment to acquire intangible assets	$ 30.4