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CONDENSED CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares
Sep. 30, 2021
Dec. 31, 2020
Statement of Financial Position [Abstract]    
Common stock, par value (in USD per share) $ 0.10 $ 0.10
Common stock, shares authorized (in shares) 120,000,000 120,000,000
Common stock, shares issued (in shares) 106,806,000 106,457,000
Common stock, shares outstanding (in shares) 84,880,000 85,449,000
Deferred stock units, outstanding (in shares) 90,000 87,000
Treasury stock, shares (in shares) 21,926,000 21,008,000