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CONSOLIDATED BALANCE SHEETS (Parenthetical) - USD ($) $ in Millions	Mar. 31, 2021	Dec. 31, 2020	Mar. 31, 2020
Statement of Financial Position [Abstract]
Accounts receivable, allowances for credit losses	$ 13.1	$ 15.9	$ 20.9
Common stock, par value (USD per share)	$ 1.00	$ 1.00	$ 1.00
Common stock authorized (in shares)	1,000,000,000.0	1,000,000,000.0	1,000,000,000.0
Common stock issued (in shares)	441,400,000	441,400,000	441,400,000
Treasury stock (in shares)	92,600,000	93,200,000	94,500,000

X

- Definition

Amount of allowance for credit loss on accounts receivable, classified as current.

+ References

Reference 1: http://www.xbrl.org/2003/role/disclosureRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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Face amount or stated value per share of common stock.

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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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