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CONDENSED CONSOLIDATED STATEMENT OF EQUITY (UNAUDITED) - 9 months ended Sep. 30, 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 | 150.7 |  |  |  | 150.7 |
Stock-based compensation | 11.8 |  | 4.3 | 7.5 |  |
Shares issued under stock plans (shares) |  | 1.4 |  |  |  |
Shares issued under stock plans | 40.4 | $ 0.3 | 33.9 | 6.2 |  |
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 | (29.6) |  |  |  | (29.6) |
Other adjustments to capital in excess of par value | (4.7) |  | (4.7) |  |  |
Other comprehensive income, net of tax | 56.2 |  |  |  |  | 56.2
Balance at Sep. 30, 2017 | 1,316.9 | $ 18.7 | $ 302.9 | $ (62.7) | 1,188.6 | $ (130.6)
Balance (in shares) at Sep. 30, 2017 |  | 75.1 |  |  |  |
Increase (Decrease) in Equity [Roll Forward] |  |  |  |  |  |
Effect of modified retrospective application of a new accounting standard | $ (4.1) |  |  |  | $ (4.1) |

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