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CONDENSED CONSOLIDATED STATEMENT OF EQUITY (UNAUDITED) - 3 months ended Mar. 31, 2017 - USD ($) shares in Millions, $ 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, 2016 | $ 1,117.5 | $ 18.4 | $ 260.4 | $ (46.1) | $ 1,071.6 | $ (186.8)
Balance (in shares) at Dec. 31, 2016 |  | 73.7 |  |  |  |
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |
Net income | 60.9 |  |  |  | 60.9 |
Stock-based compensation | 6.8 |  | (0.7) | 7.5 |  |
Shares issued under stock plans (shares) |  | 0.7 |  |  |  |
Shares issued under stock plans | 20.0 | $ 0.2 | 16.7 | 3.1 |  |
Shares repurchased under share repurchase program | (26.9) |  |  | (26.9) |  |
Shares repurchased for employee tax withholdings (shares) |  | 0.0 |  |  |  |
Shares repurchased for employee tax withholdings | (3.8) |  | (0.4) | (3.4) |  |
Dividends declared | (9.6) |  |  |  | (9.6) |
Other comprehensive income, net of tax | 7.8 |  |  |  |  | 7.8
Balance at Mar. 31, 2017 | 1,168.6 | $ 18.6 | $ 276.0 | $ (65.8) | 1,118.8 | $ (179.0)
Balance (in shares) at Mar. 31, 2017 |  | 74.4 |  |  |  |
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |
Effect of modified retrospective application of a new accounting standard | $ (4.1) |  |  |  | $ (4.1) |

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