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Consolidated Statements of Stockholders' Equity - USD ($) $ in Millions | Class A Common Stock | Class B Common Stock | Additional Paid-In Capital | Retained Earnings | Accumulated Other Comprehensive Income (Loss) | Total
--- | --- | --- | --- | --- | --- | ---
Balance at the beginning of the period at Dec. 31, 2018 | $ 2.8 | $ 0.6 | $ 568.3 | $ 440.7 | $ (121.1) | $ 891.3
Balance (in shares) at Dec. 31, 2018 | 27,646,465 | 6,329,290 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  | 131.5 |  | 131.5
Other comprehensive income |  |  |  |  | (9.7) | (9.7)
Comprehensive income |  |  |  |  |  | 121.8
Shares of Class B common stock converted to Class A common stock (in shares) | 50,000 | (50,000) |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options |  |  | 2.1 |  |  | 2.1
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 38,288 |  |  |  |  |
Stock-based compensation |  |  | 17.8 |  |  | 17.8
Stock repurchase |  |  |  | (19.5) |  | (19.5)
Stock repurchase (in shares) | (227,620) |  |  |  |  |
Net change in restricted stock and performance stock units |  |  | 3.3 | (7.4) |  | (4.1)
Net change in restricted and performance stock units (in shares) | 79,283 |  |  |  |  |
Common stock dividends |  |  |  | (31.4) |  | (31.4)
Balance at the end of the period at Dec. 31, 2019 | $ 2.8 | $ 0.6 | 591.5 | 513.9 | (130.8) | 978.0
Balance (in shares) at Dec. 31, 2019 | 27,586,416 | 6,279,290 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  | 114.3 |  | 114.3
Other comprehensive income |  |  |  |  | 30.8 | 30.8
Comprehensive income |  |  |  |  |  | 145.1
Shares of Class B common stock converted to Class A common stock (in shares) | 135,000 | (135,000) |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options |  |  | 0.4 |  |  | 0.4
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 4,666 |  |  |  |  |
Stock-based compensation |  |  | 12.7 |  |  | 12.7
Stock repurchase |  |  |  | (28.9) |  | (28.9)
Stock repurchase (in shares) | (331,531) |  |  |  |  |
Net change in restricted stock and performance stock units |  |  | 1.7 | (7.8) |  | (6.1)
Net change in restricted and performance stock units (in shares) | 83,961 |  |  |  |  |
Common stock dividends |  |  |  | (31.4) |  | (31.4)
Balance at the end of the period at Dec. 31, 2020 | $ 2.8 | $ 0.6 | 606.3 | 560.1 | (100.0) | 1,069.8
Balance (in shares) at Dec. 31, 2020 | 27,478,512 | 6,144,290 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  | 165.7 |  | 165.7
Other comprehensive income |  |  |  |  | (27.3) | (27.3)
Comprehensive income |  |  |  |  |  | 138.4
Shares of Class B common stock converted to Class A common stock (in shares) | 120,000 | (120,000) |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options |  |  | 0.1 |  |  | 0.1
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 1,440 |  |  |  |  |
Stock-based compensation |  |  | 22.9 |  |  | 22.9
Stock repurchase |  |  |  | (16.0) |  | (16.0)
Stock repurchase (in shares) | (109,998) |  |  |  |  |
Net change in restricted stock and performance stock units |  |  | 1.9 | (9.6) |  | (7.7)
Net change in restricted and performance stock units (in shares) | 94,571 |  |  |  |  |
Common stock dividends |  |  |  | (34.3) |  | (34.3)
Balance at the end of the period at Dec. 31, 2021 | $ 2.8 | $ 0.6 | $ 631.2 | $ 665.9 | $ (127.3) | $ 1,173.2
Balance (in shares) at Dec. 31, 2021 | 27,584,525 | 6,024,290 |  |  |  |

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