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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY - USD ($) $ in Millions | Total | Common Stock Class A Common Stock | Common Stock Common Stock | Capital in Excess of Par Value | Retained Earnings | Accumulated Other Comprehensive Loss | Treasury Stock
--- | --- | --- | --- | --- | --- | --- | ---
Balance at the beginning of period at Dec. 31, 2022 |  | $ 130.2 | $ 164.7 | $ 555.9 | $ 2,885.0 |  | $ (1,905.7)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of Class A Common Stock |  | 0.0 | 0.0 |  |  |  |
Issuance of share units |  |  |  | (10.3) |  |  |
Vesting of share units |  |  |  | (3.1) |  |  | 3.1
Stock based compensation expense |  |  |  | 8.1 |  |  |
Exercise of stock options |  |  |  | 6.5 |  |  | 1.8
Issuance of share based compensation |  |  |  | 11.2 |  |  |
Net earnings | $ 283.9 |  |  |  | 283.9 |  |
Dividends on stock |  |  |  |  | (90.5) |  |
Stock incentives and directors’ compensation |  |  |  |  |  |  | 0.3
Shares repurchased |  |  |  |  |  |  | (69.6)
Excise tax on repurchases of common stock |  |  |  |  |  |  | (0.7)
Balance at end of period at Jun. 30, 2023 | 1,888.4 | 130.2 | 164.7 | 568.3 | 3,078.4 | $ (82.4) | (1,970.8)
Balance at the beginning of period at Mar. 31, 2023 |  | 130.2 | 164.7 | 564.3 | 2,966.5 |  | (1,955.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of Class A Common Stock |  | 0.0 | 0.0 |  |  |  |
Issuance of share units |  |  |  | (0.2) |  |  |
Vesting of share units |  |  |  | 0.0 |  |  | 0.0
Stock based compensation expense |  |  |  | 1.3 |  |  |
Exercise of stock options |  |  |  | 1.8 |  |  | 1.6
Issuance of share based compensation |  |  |  | 1.1 |  |  |
Net earnings | 157.0 |  |  |  | 157.0 |  |
Dividends on stock |  |  |  |  | (45.1) |  |
Stock incentives and directors’ compensation |  |  |  |  |  |  | 0.3
Shares repurchased |  |  |  |  |  |  | (17.1)
Excise tax on repurchases of common stock |  |  |  |  |  |  | (0.1)
Balance at end of period at Jun. 30, 2023 | 1,888.4 | 130.2 | 164.7 | 568.3 | 3,078.4 | (82.4) | (1,970.8)
Balance at the beginning of period at Dec. 31, 2023 | 1,844.4 | 130.1 | 164.7 | 578.2 | 3,258.1 |  | (2,202.5)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of Class A Common Stock |  | 0.0 | 0.0 |  |  |  |
Issuance of share units |  |  |  | (15.0) |  |  |
Vesting of share units |  |  |  | (1.8) |  |  | 1.9
Stock based compensation expense |  |  |  | 9.4 |  |  |
Exercise of stock options |  |  |  | 6.3 |  |  | 3.2
Issuance of share based compensation |  |  |  | 16.0 |  |  |
Net earnings | 303.8 |  |  |  | 303.8 |  |
Dividends on stock |  |  |  |  | (94.3) |  |
Stock incentives and directors’ compensation |  |  |  |  |  |  | 0.2
Shares repurchased |  |  |  |  |  |  | (153.2)
Excise tax on repurchases of common stock |  |  |  |  |  |  | (1.5)
Balance at end of period at Jun. 30, 2024 | 1,911.6 | 130.1 | 164.7 | 593.1 | 3,467.6 | (92.0) | (2,351.9)
Balance at the beginning of period at Mar. 31, 2024 |  | 130.1 | 164.7 | 589.5 | 3,358.6 |  | (2,273.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of Class A Common Stock |  | 0.0 | 0.0 |  |  |  |
Issuance of share units |  |  |  | (0.4) |  |  |
Vesting of share units |  |  |  | 0.0 |  |  | 0.1
Stock based compensation expense |  |  |  | 1.7 |  |  |
Exercise of stock options |  |  |  | 0.9 |  |  | 0.5
Issuance of share based compensation |  |  |  | 1.4 |  |  |
Net earnings | 156.2 |  |  |  | 156.2 |  |
Dividends on stock |  |  |  |  | (47.2) |  |
Stock incentives and directors’ compensation |  |  |  |  |  |  | 0.2
Shares repurchased |  |  |  |  |  |  | (78.7)
Excise tax on repurchases of common stock |  |  |  |  |  |  | (0.8)
Balance at end of period at Jun. 30, 2024 | $ 1,911.6 | $ 130.1 | $ 164.7 | $ 593.1 | $ 3,467.6 | $ (92.0) | $ (2,351.9)

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