Defined Benefit Plans (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 30, 2018
Defined benefit pension plans | U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions, current fiscal year		$ 30.0
Defined benefit pension plans | Non-U.S.
Defined Benefit Plan Disclosure [Line Items]
Expected future employer contributions, current fiscal year		$ 55.0
ASU 2017-07
Defined Benefit Plan Disclosure [Line Items]
New accounting pronouncement or change in accounting principle, effect of change on operating results	$ (6.9)
New accounting pronouncement or change in accounting principle, effect of change on other income	$ 6.9