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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 |  |  |  | (3.2) |  |  | 3.2
Stock based compensation expense |  |  |  | 9.3 |  |  |
Exercise of stock options |  |  |  | 7.8 |  |  | 3.5
Issuance of share based compensation |  |  |  | 11.3 |  |  |
Net earnings | $ 419.3 |  |  |  | 419.3 |  |
Dividends on stock |  |  |  |  | (135.8) |  |
Stock incentives and directors’ compensation |  |  |  |  |  |  | 0.3
Shares repurchased |  |  |  |  |  |  | (161.4)
Excise tax on repurchases of common stock |  |  |  |  |  |  | (1.6)
Balance at end of period at Sep. 30, 2023 | 1,882.4 | 130.2 | 164.7 | 570.8 | 3,168.5 | $ (90.1) | (2,061.7)
Balance at the beginning of period at Jun. 30, 2023 |  | 130.2 | 164.7 | 568.3 | 3,078.4 |  | (1,970.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of Class A Common Stock |  | 0.0 | 0.0 |  |  |  |
Issuance of share units |  |  |  | 0.0 |  |  |
Vesting of share units |  |  |  | (0.1) |  |  | 0.1
Stock based compensation expense |  |  |  | 1.2 |  |  |
Exercise of stock options |  |  |  | 1.3 |  |  | 1.7
Issuance of share based compensation |  |  |  | 0.1 |  |  |
Net earnings | 135.4 |  |  |  | 135.4 |  |
Dividends on stock |  |  |  |  | (45.3) |  |
Stock incentives and directors’ compensation |  |  |  |  |  |  | 0.0
Shares repurchased |  |  |  |  |  |  | (91.8)
Excise tax on repurchases of common stock |  |  |  |  |  |  | (0.9)
Balance at end of period at Sep. 30, 2023 | 1,882.4 | 130.2 | 164.7 | 570.8 | 3,168.5 | (90.1) | (2,061.7)
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 |  |  |  | (1.9) |  |  | 1.9
Stock based compensation expense |  |  |  | 11.3 |  |  |
Exercise of stock options |  |  |  | 11.0 |  |  | 6.3
Issuance of share based compensation |  |  |  | 16.1 |  |  |
Net earnings | 423.9 |  |  |  | 423.9 |  |
Dividends on stock |  |  |  |  | (141.0) |  |
Stock incentives and directors’ compensation |  |  |  |  |  |  | 0.2
Shares repurchased |  |  |  |  |  |  | (237.1)
Excise tax on repurchases of common stock |  |  |  |  |  |  | (2.4)
Balance at end of period at Sep. 30, 2024 | 1,916.7 | 130.1 | 164.7 | 599.7 | 3,541.0 | (85.2) | (2,433.6)
Balance at the beginning of period at Jun. 30, 2024 |  | 130.1 | 164.7 | 593.1 | 3,467.6 |  | (2,351.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |  |
Conversion of Class A Common Stock |  | 0.0 | 0.0 |  |  |  |
Issuance of share units |  |  |  | 0.0 |  |  |
Vesting of share units |  |  |  | (0.1) |  |  | 0.0
Stock based compensation expense |  |  |  | 1.9 |  |  |
Exercise of stock options |  |  |  | 4.7 |  |  | 3.1
Issuance of share based compensation |  |  |  | 0.1 |  |  |
Net earnings | 120.1 |  |  |  | 120.1 |  |
Dividends on stock |  |  |  |  | (46.7) |  |
Stock incentives and directors’ compensation |  |  |  |  |  |  | 0.0
Shares repurchased |  |  |  |  |  |  | (83.9)
Excise tax on repurchases of common stock |  |  |  |  |  |  | (0.9)
Balance at end of period at Sep. 30, 2024 | $ 1,916.7 | $ 130.1 | $ 164.7 | $ 599.7 | $ 3,541.0 | $ (85.2) | $ (2,433.6)

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