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CONSOLIDATED BALANCE SHEETS (Parenthetical) - $ / shares | Sep. 30, 2021 | Dec. 31, 2020
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Statement of Financial Position [Abstract] |  |
Common stock, par value (in dollars per share) | $ 0.01 | $ 0.01
Common stock, shares authorized (in shares) | 153,000,000.0 | 153,000,000.0
Common stock, shares outstanding (in shares) | 58,500,000 | 58,500,000
Treasury stock, at cost (in shares) | 17,700,000 | 14,500,000

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