Inventories (Details) - USD ($) $ in Millions	Jun. 28, 2020	Dec. 29, 2019
Inventories
Raw materials and supplies	$ 251.9	$ 231.2
Work in process	84.0	108.3
Finished goods	63.8	61.7
Total inventories, gross	399.7	401.2
Reduction to LIFO cost basis	(7.4)	(7.8)
Total inventories, net	$ 392.3	$ 393.4

Amount before valuation and LIFO reserves of completed merchandise or goods expected to be sold within one year or operating cycle, if longer.

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Gross amount, as of the balance sheet date, of merchandise, goods, commodities, or supplies held for future sale or to be used in manufacturing, servicing or production process.

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Amount by which inventory stated at last-in first-out (LIFO) is less than (in excess of) inventory stated at other inventory cost methods.

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Amount after valuation and LIFO reserves of inventory expected to be sold, or consumed within one year or operating cycle, if longer.

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Gross amount of unprocessed materials to be used in manufacturing or production process and supplies that will be consumed.

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Amount before valuation and LIFO reserves of merchandise or goods in the production process expected to be completed within one year or operating cycle, if longer.

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