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CONSOLIDATED BALANCE SHEET (Parenthetical) - USD ($) shares in Millions, $ in Millions	Jun. 30, 2018	Dec. 31, 2017
Current assets
Trade receivables, allowance (in dollars)	$ 14.8	$ 16.2
Stockholders’ equity
Common stock, par value (in dollars per share)	$ 0.01	$ 0.01
Common authorized (in shares)	300.0	300.0
Common issued (in shares)	131.2	130.4
Treasury stock (in shares)	58.1	50.2

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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- Definition

Face amount or stated value per share of common stock.

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- Definition

The maximum number of common shares permitted to be issued by an entity's charter and bylaws.

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Total number of common shares of an entity that have been sold or granted to shareholders (includes common shares that were issued, repurchased and remain in the treasury). These shares represent capital invested by the firm's shareholders and owners, and may be all or only a portion of the number of shares authorized. Shares issued include shares outstanding and shares held in the treasury.

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Number of common and preferred shares that were previously issued and that were repurchased by the issuing entity and held in treasury on the financial statement date. This stock has no voting rights and receives no dividends.

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