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Acquisitions and Divestitures (Narrative) (Details) - USD ($) $ in Millions		3 Months Ended			9 Months Ended		12 Months Ended
	Dec. 31, 2017	Jun. 30, 2019	Jul. 01, 2018	Apr. 01, 2018	Jun. 30, 2019	Jul. 01, 2018	Sep. 30, 2018	Aug. 26, 2018
Business Acquisition [Line Items]
Gain resulting from acquisition of joint venture		$ 0.0	$ 2.5		$ 0.0	$ 1,376.4
Goodwill		3,564.7			3,564.7		$ 3,541.6
Finite-Lived Intangible Assets, Accumulated Amortization		558.9			558.9		371.0
Deconsolidation, Gain (Loss), Amount					622.8	$ 496.3
Starbucks Coffee Thailand [Member]
Business Acquisition [Line Items]
Deconsolidation, Gain (Loss), Amount		601.9
Taiwan JV [Member]
Business Acquisition [Line Items]
Sale of Ownership Interest in Retail Business				$ 181.2
Deconsolidation, Gain (Loss), Amount				$ 156.6
East China JV [Member]
Business Acquisition [Line Items]
Business Acquisition, Effective Date of Acquisition	Dec. 31, 2017
Preexisting ownership percentage in equity method investment				50.00%
Amount paid for interest acquired				$ 1,400.0
Gain resulting from acquisition of joint venture							1,400.0
Taiwan JV [Member]
Business Acquisition [Line Items]
Preexisting ownership percentage in equity method investment				50.00%
Acquired and reacquired rights
Business Acquisition [Line Items]
Finite-Lived Intangible Assets, Accumulated Amortization		$ 496.1			$ 496.1		$ 320.1
Nestle Global Coffee Alliance [Member]
Business Acquisition [Line Items]
Deferred Revenue								$ 7,000.0