Derivative Instruments (Effect of Derivative Instruments) (Details) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Oct. 01, 2017	Oct. 02, 2016	Oct. 01, 2017	Oct. 02, 2016
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in AOCI	$ 1.0	$ (1.0)	$ (1.9)	$ 3.4
Net foreign exchange gain (loss) recognized in other income and expense	0.8	0.1	(0.8)	(0.2)
Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) reclassified from AOCI into cost of sales	(0.8)	(0.1)	0.0	2.9
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) reclassified from AOCI into cost of sales	0.4	0.0	0.9	0.0
Other Operating Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) reclassified from AOCI into cost of sales	$ (3.0)	$ 0.0	$ (9.3)	$ 0.0