Consolidated Statement of Comprehensive Income (Loss) (Unaudited) (Parenthetical) - USD ($) $ in Millions	3 Months Ended
	Apr. 02, 2016	Mar. 28, 2015
Statement of Comprehensive Income [Abstract]
Tax provision (benefit) on unrealized holding gains and losses on available-for-sale investments arising during the period	$ (0.4)	$ 0.0
Tax provision (benefit) on unrealized holding gains and losses on hedging instruments arising during the period	(22.4)	(4.9)
Tax provision (benefit) on reclassification adjustment for losses on hedging instruments recognized in net income	(0.5)	(0.1)
Tax provision (benefit) on pension and other postretirement benefit liability adjustments arising during the period	(1.1)	2.9
Tax provision (benefit) on amortization of net loss and prior service benefit included in net periodic pension cost	$ (0.3)	$ (0.7)