| **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, 2020                                   |      | $ 130.8                           | $ 164.6                   | $ 520.4                        | $ 2,509.6         |                                 | $ (1,155.9)    |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                        |      |                              |                      |                           |              |                                 |           |
| Conversion of Class A Common Stock                                               |      | (0.2)                             | 0.1                       | 0.2                            |              |                                 |           |
| Issuance of share units                                                               |      |                              |                      | (5.3)                          |              |                                 |           |
| Vesting of share units                                                                |      |                              |                      | (1.7)                          |              |                                 | 1.7            |
| Stock based compensation expense                                                      |      |                              |                      | 7.2                            |              |                                 |           |
| Exercise of stock options                                                             |      |                              |                      | 2.6                            |              |                                 | 1.9            |
| Stock incentives                                                                      |      |                              |                      | 5.3                            |              |                                 |           |
| Net earnings                                                                          | $ 97.7    |                              |                      |                           | 97.7              |                                 |           |
| Cash dividends on stock                                                               |      |                              |                      |                           | (42.2)            |                                 |           |
| Shares repurchased                                                                    |      |                              |                      |                           |              |                                 | (67.0)         |
| Balance at end of period at Mar. 31, 2021                                             | 1,849.0   | 130.6                             | 164.7                     | 528.7                          | 2,565.1           | $ (320.8)                            | (1,219.3)      |
| Balance at the beginning of period at Dec. 31, 2021                                   | 1,832.2   | 130.5                             | 164.7                     | 545.2                          | 2,826.6           |                                 | (1,503.4)      |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**                        |      |                              |                      |                           |              |                                 |           |
| Conversion of Class A Common Stock                                               |      | 0.0                               | 0.0                       | 0.0                            |              |                                 |           |
| Issuance of share units                                                               |      |                              |                      | (5.8)                          |              |                                 |           |
| Vesting of share units                                                                |      |                              |                      | (2.4)                          |              |                                 | 2.4            |
| Stock based compensation expense                                                      |      |                              |                      | 7.7                            |              |                                 |           |
| Exercise of stock options                                                             |      |                              |                      | 0.4                            |              |                                 | (2.9)          |
| Stock incentives                                                                      |      |                              |                      | 5.8                            |              |                                 |           |
| Net earnings                                                                          | 119.8     |                              |                      |                           | 119.8             |                                 |           |
| Cash dividends on stock                                                               |      |                              |                      |                           | (44.2)            |                                 |           |
| Shares repurchased                                                                    |      |                              |                      |                           |              |                                 | (107.9)        |
| Balance at end of period at Mar. 31, 2022                                             | $ 1,808.9 | $ 130.5                           | $ 164.7                   | $ 550.9                        | $ 2,902.2         | $ (327.6)                            | $ (1,611.8)    |

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Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.
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Amount of paid and unpaid common stock dividends declared with the form of settlement in cash.
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The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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The gross value of stock issued during the period upon the conversion of convertible securities.
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Value of stock issued as a result of the exercise of stock options, after deduction of related income tax (expense) benefit.
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| - Definition
Total of all stockholders' equity (deficit) items, net of receivables from officers, directors, owners, and affiliates of the entity which are attributable to the parent. The amount of the economic entity's stockholders' equity attributable to the parent excludes the amount of stockholders' equity which is allocable to that ownership interest in subsidiary equity which is not attributable to the parent (noncontrolling interest, minority interest). This excludes temporary equity and is sometimes called permanent equity.
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Equity impact of the cost of common and preferred stock that were repurchased during the period. Recorded using the cost method.
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