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Defined Benefit Plans (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended 9 Months Ended
Sep. 29, 2017
Sep. 29, 2017
Sep. 28, 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     $ 50.0
ASU 2017-07      
Defined Benefit Plan Disclosure [Line Items]      
New accounting pronouncement or change in accounting principle, effect of change on other income $ 8.3 $ 22.2  
New accounting pronouncement or change in accounting principle, effect of change on operating results $ (8.3) $ (22.2)