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+ Details

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