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Acquisitions (Pro Forma Financial Information) (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended | 12 Months Ended
--- | --- | --- | ---
Sep. 27, 2019 | Sep. 28, 2018 | Sep. 27, 2019 | Sep. 28, 2018 | Dec. 31, 2018
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |
Pro forma earnings, adjustments | $ 673.9 | $ 663.7 | $ 1,739.0 | $ 1,904.1 |
IDT | Acquisition-related transaction costs |  |  |  |  |
Business Acquisition, Pro Forma Information, Nonrecurring Adjustment [Line Items] |  |  |  |  |
Pro forma earnings, adjustments |  |  |  |  | $ 15.0

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