Derivative Instruments (Effect of Derivative Instruments) (Details) - Designated as Hedging Instrument - Cash Flow Hedging - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Oct. 01, 2017	Sep. 30, 2018	Oct. 01, 2017
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) recognized in AOCI	$ 3.2	$ 1.0	$ 3.1	$ (1.9)
Net foreign exchange gain (loss) recognized in other income and expense	(0.2)	0.8	(0.4)	(0.8)
Cost of sales
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) reclassified from AOCI into cost of sales	0.0	(0.8)	2.0	0.0
Interest Expense
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) reclassified from AOCI into cost of sales	0.6	0.4	1.7	0.9
Other Operating Income (Expense)
Derivative Instruments, Gain (Loss) [Line Items]
Net gain (loss) reclassified from AOCI into cost of sales	$ (0.6)	$ (3.0)	$ 2.4	$ (9.3)