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Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Total | Common Stock | Additional Paid-in Capital | Retained Earnings | Accumulated other comprehensive income (loss)
--- | --- | --- | --- | --- | ---
Balance at beginning of year at Dec. 31, 2016 |  | $ 2.9 | $ 37.4 | $ 1,940.1 | $ (47.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Stock options exercised |  |  | 9.5 |  |
Purchases of common stock |  |  | (43.6) | (39.0) |
Stock-based compensation |  |  | 5.2 |  |
Net earnings | $ 578.6 |  |  | 578.6 |
Dividends paid in cash |  |  |  | (369.1) |
Other comprehensive income (loss) |  |  |  |  | 22.2
Balance at end of year at Dec. 31, 2017 | $ 2,096.9 | 2.9 | 8.5 | 2,110.6 | (25.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cash dividends paid per share of common stock (in dollars per share) | $ 0.64 |  |  |  |
Stock options exercised |  |  | 13.4 |  |
Purchases of common stock |  |  | (24.0) | (79.0) |
Stock-based compensation |  |  | 5.1 |  |
Net earnings | $ 751.9 |  |  | 751.9 |
Dividends paid in cash |  |  |  | (441.9) |
Other comprehensive income (loss) |  |  |  |  | (19.7)
Balance at end of year at Dec. 31, 2018 | $ 2,302.7 | 2.9 | 3.0 | 2,341.6 | (44.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cash dividends paid per share of common stock (in dollars per share) | $ 0.77 |  |  |  |
Stock options exercised |  |  | 58.5 |  |
Purchases of common stock |  |  | 0.0 | 0.0 |
Stock-based compensation |  |  | 5.7 |  |
Net earnings | $ 790.9 |  |  | 790.9 |
Dividends paid in cash |  |  |  | (498.6) |
Other comprehensive income (loss) |  |  |  |  | 6.4
Balance at end of year at Dec. 31, 2019 | $ 2,665.6 | $ 2.9 | $ 67.2 | $ 2,633.9 | $ (38.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |
Cash dividends paid per share of common stock (in dollars per share) | $ 0.87 |  |  |  |

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