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CONDENSED CONSOLIDATED STATEMENT OF EQUITY (UNAUDITED) - 6 months ended Jun. 30, 2018 - USD ($) $ in Millions | Total | Common Stock [Member] | Capital in Excess of Par Value [Member] | Treasury Stock [Member] | Retained Earnings [Member] | Accumulated Other Comprehensive Loss [Member]
--- | --- | --- | --- | --- | --- | ---
Balance at Dec. 31, 2017 | $ 1,279.9 | $ 18.8 | $ 309.3 | $ (109.1) | $ 1,178.2 | $ (117.3)
Balance (in shares) at Dec. 31, 2017 |  | 75,200,000 |  | 1,300,000 |  |
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |
Net income | 99.7 |  |  |  | 99.7 |
Stock-based compensation | 11.5 |  | 2.2 | $ 9.3 |  |
Shares issued under stock plans (shares) |  | 100,000 |  | (300,000) |  |
Shares issued under stock plans | $ 12.3 | $ 0.0 | (7.0) | $ 19.3 |  |
Shares purchased under share repurchase program (shares) | 800,000 |  |  | 800,000 |  |
Shares purchased under share repurchase program | $ (70.8) |  |  | $ (70.8) |  |
Shares repurchased for employee tax withholdings (shares) |  | 0 |  |  |  |
Shares repurchased for employee tax withholdings | (4.4) |  | 0.2 | (4.6) |  |
Dividends declared | (31.3) |  |  |  | (31.3) |
Other comprehensive income, net of tax | (26.4) |  |  |  |  | (26.4)
Balance at Jun. 30, 2018 | 1,281.9 | $ 18.8 | $ 304.7 | $ (155.9) | 1,258.0 | $ (143.7)
Balance (in shares) at Jun. 30, 2018 |  | 75,300,000 |  | 1,800,000 |  |
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |
Effect of modified retrospective application of a new accounting standard | $ 11.4 |  |  |  | $ 11.4 |

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