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CONSOLIDATED STATEMENT OF EQUITY - USD ($) $ in Millions | Total | Cumulative Effect, Period of Adoption, Adjustment | Common Stock | Capital in Excess of Par Value | Treasury Stock | Retained earnings | Retained earnings Cumulative Effect, Period of Adoption, Adjustment | Accumulated other comprehensive loss
--- | --- | --- | --- | --- | --- | --- | --- | ---
Balance (in shares) at Dec. 31, 2017 |  |  | 75,200,000 |  | 1,300,000 |  |  |
Beginning balance at Dec. 31, 2017 | $ 1,279.9 |  | $ 18.8 | $ 309.3 | $ (109.1) | $ 1,178.2 |  | $ (117.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 206.9 |  |  |  |  | 206.9 |  |
Activity related to stock-based compensation (in shares) |  |  | 100,000 |  | (900,000) |  |  |
Activity related to stock-based compensation | 48.9 |  |  | (27.3) | $ 76.2 |  |  |
Shares purchased under share repurchase program (in shares) |  |  |  |  | 800,000 |  |  |
Shares purchased under share repurchase program | $ (70.8) |  |  |  | $ (70.8) |  |  |
Dividends declared per share (in dollars per share) | $ 0.58 |  |  |  |  |  |  |
Dividends declared | $ (43.1) |  |  |  |  | (43.1) |  |
Other comprehensive income, net of tax | (36.9) |  |  |  |  |  |  | (36.9)
Balance (in shares) at Dec. 31, 2018 |  |  | 75,300,000 |  | 1,200,000 |  |  |
Ending balance at Dec. 31, 2018 | $ 1,396.3 | $ 11.4 | $ 18.8 | 282.0 | $ (103.7) | 1,353.4 | $ 11.4 | (154.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Accounting Standards Update [Extensible List] | us-gaap:AccountingStandardsUpdate201613Member |  |  |  |  |  |  |
Net income | $ 241.7 |  |  |  |  | 241.7 |  |
Activity related to stock-based compensation (in shares) |  |  |  |  | (800,000) |  |  |
Activity related to stock-based compensation | 54.5 |  |  | (11.1) | $ 65.6 |  |  |
Shares purchased under share repurchase program (in shares) |  |  |  |  | 800,000 |  |  |
Shares purchased under share repurchase program | (83.1) |  |  |  | $ (83.1) |  |  |
Purchase of investment in affiliated companies | $ 4.9 |  |  | 1.8 | $ 3.1 |  |  |
Dividends declared per share (in dollars per share) | $ 0.62 |  |  |  |  |  |  |
Dividends declared | $ (45.7) |  |  |  |  | (45.7) |  |
Other comprehensive income, net of tax | 4.6 |  |  |  |  |  |  | 4.6
Balance (in shares) at Dec. 31, 2019 |  |  | 75,300,000 |  | 1,200,000 |  |  |
Ending balance at Dec. 31, 2019 | 1,573.2 | $ (0.1) | $ 18.8 | 272.7 | $ (118.1) | 1,549.4 | $ (0.1) | (149.6)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |  |
Net income | 346.2 |  |  |  |  | 346.2 |  |
Activity related to stock-based compensation (in shares) |  |  |  |  | (700,000) |  |  |
Activity related to stock-based compensation | $ 60.5 |  |  | (5.4) | $ 65.9 |  |  |
Shares purchased under share repurchase program (in shares) | 761,500 |  |  |  | 800,000 |  |  |
Shares purchased under share repurchase program | $ (115.5) |  |  |  | $ (115.5) |  |  |
Dividends declared per share (in dollars per share) | $ 0.66 |  |  |  |  |  |  |
Dividends declared | $ (48.8) |  |  |  |  | (48.8) |  |
Other comprehensive income, net of tax | 39.0 |  |  |  |  |  |  | 39.0
Balance (in shares) at Dec. 31, 2020 |  |  | 75,300,000 |  | 1,300,000 |  |  |
Ending balance at Dec. 31, 2020 | $ 1,854.5 |  | $ 18.8 | $ 267.3 | $ (167.7) | $ 1,846.7 |  | $ (110.6)

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