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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, 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 |  |  |  | 85.1 |  | 85.1
Other comprehensive income |  |  |  |  | 6.7 | 6.7
Comprehensive income |  |  |  |  |  | 91.8
Shares of Class B common stock converted to Class A common stock (in shares) | 70,000 | (70,000) |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 661 |  |  |  |  |
Stock-based compensation |  |  | 8.8 |  |  | 8.8
Stock repurchase |  |  |  | (24.8) |  | (24.8)
Stock repurchase (in shares) | (294,677) |  |  |  |  |
Net change in restricted stock and performance stock units |  |  | 1.8 | (7.8) |  | (6.0)
Net change in restricted and performance stock units (in shares) | 83,080 |  |  |  |  |
Common stock dividends |  |  |  | (23.2) |  | (23.2)
Balance at the end of the period at Sep. 27, 2020 | $ 2.8 | $ 0.6 | 602.1 | 543.2 | (124.1) | 1,024.6
Balance (in shares) at Sep. 27, 2020 | 27,445,480 | 6,209,290 |  |  |  |
Balance at the beginning of the period at Jun. 28, 2020 | $ 2.8 | $ 0.6 | 598.9 | 521.4 | (138.5) | 985.2
Balance (in shares) at Jun. 28, 2020 | 27,461,833 | 6,229,290 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  | 32.9 |  | 32.9
Other comprehensive income |  |  |  |  | 14.4 | 14.4
Comprehensive income |  |  |  |  |  | 47.3
Shares of Class B common stock converted to Class A common stock (in shares) | 20,000 | (20,000) |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 661 |  |  |  |  |
Stock-based compensation |  |  | 3.2 |  |  | 3.2
Stock repurchase |  |  |  | (3.7) |  | (3.7)
Stock repurchase (in shares) | (41,142) |  |  |  |  |
Net change in restricted and performance stock units (in shares) | 4,128 |  |  |  |  |
Common stock dividends |  |  |  | (7.4) |  | (7.4)
Balance at the end of the period at Sep. 27, 2020 | $ 2.8 | $ 0.6 | 602.1 | 543.2 | (124.1) | 1,024.6
Balance (in shares) at Sep. 27, 2020 | 27,445,480 | 6,209,290 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Change in accounting principle |  |  |  |  |  | 560.1
Balance at the beginning 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 |  |  |  | 125.6 |  | 125.6
Other comprehensive income |  |  |  |  | (17.1) | (17.1)
Comprehensive income |  |  |  |  |  | 108.5
Shares of Class B common stock converted to Class A common stock (in shares) | 80,000 | (80,000) |  |  |  |
Shares of Class A common stock issued upon the exercise of stock options (in shares) | 112 |  |  |  |  |
Stock-based compensation |  |  | 16.8 |  |  | 16.8
Stock repurchase |  |  |  | (11.8) |  | (11.8)
Stock repurchase (in shares) | (87,445) |  |  |  |  |
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) | 93,937 |  |  |  |  |
Common stock dividends |  |  |  | (25.5) |  | (25.5)
Balance at the end of the period at Sep. 26, 2021 | $ 2.8 | $ 0.6 | 625.0 | 638.8 | (117.1) | 1,150.1
Balance (in shares) at Sep. 26, 2021 | 27,565,116 | 6,064,290 |  |  |  |
Balance at the beginning of the period at Jun. 27, 2021 | $ 2.8 | $ 0.6 | 618.1 | 605.6 | (109.2) | 1,117.9
Balance (in shares) at Jun. 27, 2021 | 27,577,110 | 6,074,290 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Net income |  |  |  | 46.4 |  | 46.4
Other comprehensive income |  |  |  |  | (7.9) | (7.9)
Comprehensive income |  |  |  |  |  | 38.5
Shares of Class B common stock converted to Class A common stock (in shares) | 10,000 | (10,000) |  |  |  |
Stock-based compensation |  |  | 6.9 |  |  | 6.9
Stock repurchase |  |  |  | (4.0) |  | (4.0)
Stock repurchase (in shares) | (25,375) |  |  |  |  |
Net change in restricted stock and performance stock units |  |  |  | (0.4) |  | (0.4)
Net change in restricted and performance stock units (in shares) | 3,381 |  |  |  |  |
Common stock dividends |  |  |  | (8.8) |  | (8.8)
Balance at the end of the period at Sep. 26, 2021 | $ 2.8 | $ 0.6 | $ 625.0 | $ 638.8 | $ (117.1) | 1,150.1
Balance (in shares) at Sep. 26, 2021 | 27,565,116 | 6,064,290 |  |  |  |
Increase (Decrease) in Stockholders' Equity |  |  |  |  |  |
Change in accounting principle |  |  |  |  |  | $ 638.8

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