Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - $ / shares	Sep. 30, 2021	Dec. 31, 2020
Par value (in dollars per share)	$ 1.00	$ 1.00
Shares authorized (in shares)	325,000,000	325,000,000
Shares issued (in shares)	112,000,000	111,000,000
Shares outstanding (in shares)	112,000,000	111,000,000
4.00% Convertible Senior Notes due 2024 (Carrying value) \| Convertible Senior Notes
Stated interest rate	4.00%	4.00%

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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Contractual interest rate for funds borrowed, under the debt agreement.

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