Financial Instruments (Notional Amounts and Fair Values of Derivatives Designated as Cash Flow Hedges and Derivatives Not Designated as Cash Flow Hedges) (Details) - USD ($) $ in Millions	Mar. 30, 2018	Dec. 31, 2017
Derivatives, Fair Value [Line Items]
Fair Value of assets for derivatives not designated as cash flow hedges	$ 12.8	$ 27.4
Fair Value of liability for derivatives not designated as cash flow hedges	2.1	0.8
Commodity futures
Derivatives, Fair Value [Line Items]
Notional amount of derivatives not designated as cash flow hedges	100.6	106.1
Fair Value of assets for derivatives not designated as cash flow hedges	12.0	26.1
Fair Value of liability for derivatives not designated as cash flow hedges	0.9	0.1
Foreign currency exchange
Derivatives, Fair Value [Line Items]
Notional amount of derivatives not designated as cash flow hedges	78.9	105.5
Fair Value of assets for derivatives not designated as cash flow hedges	0.8	1.3
Fair Value of liability for derivatives not designated as cash flow hedges	$ 1.2	$ 0.7