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Inventories - Inventories by Major Classification (Detail) - USD ($)
$ in Millions
Sep. 29, 2018
Dec. 31, 2017
Dec. 30, 2017
Inventory Disclosure [Abstract]      
Finished goods $ 585.2   $ 541.9
Work in progress 53.4   49.3
Raw materials 129.4   122.7
Total FIFO value 768.0   713.9
Excess of current cost over LIFO cost (77.4)   (75.1)
Total inventories – net $ 690.6 $ 659.7 $ 638.8