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Acquisitions and Divestitures (Narrative) (Details) - USD ($) |  | 3 Months Ended | 6 Months Ended | 12 Months Ended |
--- | --- | --- | --- | --- | ---
Dec. 31, 2017 | Mar. 31, 2019 | Apr. 01, 2018 | Mar. 31, 2019 | Apr. 01, 2018 | Sep. 30, 2018 | Aug. 26, 2018
Business Acquisition [Line Items] |  |  |  |  |  |  |
Gain resulting from acquisition of joint venture |  | $ 0 | $ 47,600,000 | $ 0 | $ 1,373,900,000 |  |
Goodwill |  | 3,603,500,000 |  | 3,603,500,000 |  | $ 3,541,600,000 |
Finite-Lived Intangible Assets, Accumulated Amortization |  | 502,500,000 |  | 502,500,000 |  | 371,000,000.0 |
Deconsolidation, Gain (Loss), Amount |  |  |  | 21,000,000.0 | $ 496,300,000 |  |
Taiwan JV [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Sale of Ownership Interest in Retail Business |  |  | 181,200,000 |  |  |  |
Deconsolidation, Gain (Loss), Amount |  |  | $ 156,600,000 |  |  |  |
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% |  | 50.00% |  |
Amount paid for interest acquired |  |  | $ 1,400,000,000 |  |  |  |
Gain resulting from acquisition of joint venture |  |  |  |  |  | 1,400,000,000 |
Taiwan JV [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Preexisting ownership percentage in equity method investment |  |  | 50.00% |  | 50.00% |  |
Acquired and reacquired rights |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Finite-Lived Intangible Assets, Accumulated Amortization |  | $ 444,700,000 |  | $ 444,700,000 |  | $ 320,100,000 |
Nestle Global Coffee Alliance [Member] |  |  |  |  |  |  |
Business Acquisition [Line Items] |  |  |  |  |  |  |
Deferred Revenue |  |  |  |  |  |  | $ 7,000,000,000

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