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Consolidated Balance Sheets (Parenthetical) - USD ($) shares in Millions, $ in Millions	Dec. 30, 2018	Dec. 31, 2017
Allowance for trade accounts receivable	$ 13.2	$ 12.9
Class A common stock
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued (in shares)	36.6	36.6
Treasury stock, Class A shares (in shares)	1.2	1.7
Class B common stock
Common stock, par value (in dollars per share)	$ 1	$ 1
Common stock, shares issued (in shares)	3.5	3.5

X

- Definition

A valuation allowance for trade and other receivables due to an Entity within one year (or the normal operating cycle, whichever is longer) that are expected to be uncollectible.

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Face amount or stated value per share of common stock.

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