Represents the number of unissued and unsubscribed shares.

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Aggregate number of common shares reserved for future issuance.

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Aggregate dividends paid during the period for each share of common stock outstanding.

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Aggregate dividends declared during the period for each share of common stock outstanding.

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Value of common stock issued to a trust (for example, but not limited to, rabbi trust) set up specifically to accumulate stock for the sole purpose of distribution to participating employees.

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Number of common stock held in a trust that has been set up specifically to accumulate stock for the sole purpose of distribution to participating employees but not yet earned.

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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 shares of common stock outstanding. Common stock represent the ownership interest in a corporation.

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Face amount or stated value per share of preferred stock nonredeemable or redeemable solely at the option of the issuer.

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The maximum number of nonredeemable preferred shares (or preferred stock redeemable solely at the option of the issuer) permitted to be issued by an entity's charter and bylaws.

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Aggregate share number for all nonredeemable preferred stock (or preferred stock redeemable solely at the option of the issuer) held by stockholders. Does not include preferred shares that have been repurchased.

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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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Number of shares that have been repurchased during the period and are being held in treasury.

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The amount allocated to treasury stock. Treasury stock is common and preferred shares of an entity that were issued, repurchased by the entity, and are held in its treasury.

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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.

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STOCKHOLDERS' EQUITY - Capital Stock Information (Details) - USD ($) $ / shares in Units, $ in Millions		1 Months Ended	3 Months Ended									12 Months Ended
	Mar. 19, 2021	Feb. 28, 2021	Mar. 31, 2020	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Common stock, shares issued (in shares)				82,200,000								82,900,000	82,200,000
Common Stock, unissued shares (in shares)												217,100,000
Shares of common stock in treasury (in shares)				11,800,000								14,300,000	11,800,000
Value of treasury stock on an average cost basis (in dollars)				$ 406.8								$ 459.2	$ 406.8
Preferred stock, shares authorized (in shares)												50,000,000.0
Preferred stock, par value per share (in dollars per share)												$ 0.01
Preferred stock, shares outstanding (in shares)				0								0	0
Acquisition of Treasury Stock												$ 56.1	$ 7.7	$ 427.8
Common stock dividends paid (in dollars per share)				$ 0.11	$ 0.11	$ 0.11	$ 0.11	$ 0.10	$ 0.10	$ 0.10	$ 0.10
Common stock dividends declared (in dollars per share)			$ 0.12
Common Stock
Common stock, shares outstanding (in shares)				70,400,000				69,600,000				68,600,000	70,400,000	69,600,000	80,200,000
Shares of common stock in treasury (in shares)												14,300,000
Acquisition of Treasury Stock (in shares)												2,600,000	200,000	11,500,000
Stock Options and Restricted Stock
Common Stock reserved for contingently issuable shares (in shares)												2,400,000
All Company Stock Plans
Number of common shares held in rabbi trust (in shares)												700,000
Value of common shares held in rabbi trust (in dollars)												$ 17.6
Share repurchase program approved by Board of Directors
Acquisition of Treasury Stock (in shares)												2,500,000	200,000	11,400,000
Acquisition of Treasury Stock												$ 54.6	$ 4.9	$ 425.0
Subsequent Event
Common stock dividends paid (in dollars per share)	$ 0.12
Common stock dividends declared (in dollars per share)		$ 0.12