Inventories (Details) - USD ($) $ in Millions	Jun. 30, 2019	Dec. 30, 2018
Inventories
Raw materials and supplies	$ 221.5	$ 205.6
Work in process	124.6	117.5
Finished goods	53.3	50.5
Total inventories, gross	399.4	373.6
Reduction to LIFO cost basis	(9.0)	(9.3)
Total inventories, net	$ 390.4	$ 364.3

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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