Consolidated Statement of Comprehensive Income (Unaudited) (Parenthetical) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 30, 2013	Mar. 31, 2012
Statement of Income and Comprehensive Income [Abstract]
Tax (provision) benefit on unrealized holding gains and losses on available-for-sale investments arising during the period	$ (0.4)	$ 0
Tax (provision) benefit on reclassification adjustment for gains on available-for-sale investments recognized in net income	(2.5)	0
Tax (provision) benefit on reclassification adjustment for losses on hedging instruments recognized in net income	0.5	0.5
Tax (benefit) provision on pension and other postretirement benefit liability adjustments arising during the period	1.6	(0.5)
Tax (provision) benefit on amortization of net loss and prior service benefit included in net periodic pension cost	$ 0.9	$ 0.6