Other Income (Expense) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 30, 2018	Mar. 31, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Other income (expense)	$ (15.6)	$ 14.6
Non service cost components of net pension expense	(0.6)	(0.4)
Foreign currency transaction gain (loss)		0.7
Not Designated as Hedging Instrument
Derivative Instruments, Gain (Loss) [Line Items]
Gains (losses) on derivatives	$ (15.0)	$ 14.3