| **Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions** | Total       | Common Stock  | Retained Earnings | Accumulated Other Comprehensive Loss |
|-----------------------------------------------------------------------------|-------------|---------------|-------------------|--------------------------------------|
| Shares outstanding, beginning (in shares) at Dec. 31, 2020                  |        | 79,000,000.0  |              |                                 |
| Shareholders' equity, beginning at Dec. 31, 2020                            | $ 367.1     | $ 18.2        | $ 349.8           | $ (0.9)                              |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |        |          |              |                                 |
| Net income                                                                  | 249.1       |          | 249.1             |                                 |
| Issuance of common stock (in shares)                                        |        | 400,000       |              |                                 |
| Issuance of common stock                                                    | $ 2.5       | $ 2.5         |              |                                 |
| Repurchase of common stock (in shares)                                      | (942,728)   | (3,000,000.0) |              |                                 |
| Repurchase of common stock                                                  | $ (297.5)   | $ (48.5)      | (249.0)           |                                 |
| Taxes paid related to net share settlement of stock awards (in shares)      |        | (200,000)     |              |                                 |
| Taxes paid related to net share settlement of stock awards                  | (16.1)      |          | (16.1)            |                                 |
| Stock-based compensation                                                    | 27.8        | $ 27.8        |              |                                 |
| Cash dividends                                                              | (26.1)      |          | (26.1)            |                                 |
| Shareholders' equity, ending at Dec. 31, 2021                               | 306.8       | $ 0.0         | 307.7             | (0.9)                                |
| Shares outstanding, ending (in shares) at Dec. 31, 2021                     |        | 76,200,000    |              |                                 |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |        |          |              |                                 |
| Net income                                                                  | 439.4       |          | 439.4             |                                 |
| Issuance of common stock (in shares)                                        |        | 600,000       |              |                                 |
| Issuance of common stock                                                    | $ 2.7       | $ 2.7         |              |                                 |
| Repurchase of common stock (in shares)                                      | (1,747,844) | (1,800,000)   |              |                                 |
| Repurchase of common stock                                                  | $ (175.5)   | $ (34.5)      | (141.0)           |                                 |
| Taxes paid related to net share settlement of stock awards (in shares)      |        | (200,000)     |              |                                 |
| Taxes paid related to net share settlement of stock awards                  | (26.9)      |          | (26.9)            |                                 |
| Stock-based compensation                                                    | 31.8        | $ 31.8        |              |                                 |
| Cash dividends                                                              | (26.8)      |          | (26.8)            |                                 |
| Shareholders' equity, ending at Dec. 31, 2022                               | 551.5       | $ 0.0         | 552.4             | (0.9)                                |
| Shares outstanding, ending (in shares) at Dec. 31, 2022                     |        | 74,800,000    |              |                                 |
| **Increase (Decrease) in Stockholders' Equity [Roll Forward]**              |        |          |              |                                 |
| Net income                                                                  | 417.3       |          | 417.3             |                                 |
| Issuance of common stock (in shares)                                        |        | 300,000       |              |                                 |
| Issuance of common stock                                                    | $ 3.1       | $ 3.1         |              |                                 |
| Repurchase of common stock (in shares)                                      | (461,761)   | (500,000)     |              |                                 |
| Repurchase of common stock                                                  | $ (55.3)    | $ (36.0)      | (19.3)            |                                 |
| Taxes paid related to net share settlement of stock awards (in shares)      |        | (100,000)     |              |                                 |
| Taxes paid related to net share settlement of stock awards                  | (26.5)      |          | (26.5)            |                                 |
| Stock-based compensation                                                    | 32.9        | $ 32.9        |              |                                 |
| Cash dividends                                                              | (28.5)      |          | (28.5)            |                                 |
| Other                                                                       | (0.9)       |          | (0.9)             |                                 |
| Shareholders' equity, ending at Dec. 31, 2023                               | $ 893.6     | $ 0.0         | $ 894.5           | $ (0.9)                              |
| Shares outstanding, ending (in shares) at Dec. 31, 2023                     |        | 74,500,000    |              |                                 |

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|-------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of increase to additional paid-in capital (APIC) for recognition of cost for award under share-based payment arrangement.
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|------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------|
| - Definition
Amount of paid and unpaid cash, stock, and paid-in-kind (PIK) dividends declared, for example, but not limited to, common and preferred stock.
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| - Definition
A roll forward is a reconciliation of a concept from the beginning of a period to the end of a period.
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| - Definition
The portion of profit or loss for the period, net of income taxes, which is attributable to the parent.
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| - Definition
Number of shares issued which are neither cancelled nor held in the treasury.
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| - Definition
Number of shares used to settle grantee's tax withholding obligation for award under share-based payment arrangement.
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No definition available.
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Number of new stock issued during the period.
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Value of shares of stock issued attributable to transactions classified as other.
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| - Definition
Value of stock related to Restricted Stock Awards forfeited during the period.
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| - Definition
Number of shares that have been repurchased during the period and have not been retired and are not held in treasury. Some state laws may govern the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
+ References
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| - Definition
Equity impact of the value of stock that has been repurchased during the period and has not been retired and is not held in treasury. Some state laws may mandate the circumstances under which an entity may acquire its own stock and prescribe the accounting treatment therefore. This element is used when state law does not recognize treasury stock.
+ References
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| - Definition
Amount of equity (deficit) attributable to parent. Excludes temporary equity and equity attributable to noncontrolling interest.
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| - Definition
This element represents movements included in the statement of changes in stockholders' equity which are not separately disclosed or provided for elsewhere in the taxonomy.
+ References
No definition available.
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