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CONDENSED CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (UNAUDITED) - USD ($) $ in Millions | Total | Common Stock | Additional Paid In Capital | Retained Earnings | Treasury Stock | Accumulated Other Comprehensive Income (Loss)
--- | --- | --- | --- | --- | --- | ---
BEGINNING BALANCE (in shares) at Dec. 31, 2022 |  | 33,429,557 |  |  |  |
BEGINNING BALANCE at Dec. 31, 2022 | $ 493.5 | $ 0.3 | $ 228.8 | $ 513.1 |  | $ 40.6
BEGINING BALANCE, Treasury Stock (in shares) at Dec. 31, 2022 |  |  |  |  | (5,123,075) |
BEGINING BALANCE, Treasury Stock at Dec. 31, 2022 |  |  |  |  | $ (289.3) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 49.3 |  |  | 49.3 |  |
Issuance of common stock awards to employees (in shares) |  | 69,136 |  |  |  |
Surrender of common stock awards (in shares) |  |  |  |  | (581) |
Surrender of common stock awards | 0.0 |  |  |  | $ 0.0 |
Share-based compensation expense | 3.5 |  | 3.5 |  |  |
Share-based compensation issued to directors | 0.1 |  | 0.1 |  |  |
Dividends declared | (34.9) |  |  | (34.9) |  |
Other comprehensive income (loss), net of tax | (6.3) |  |  |  |  | (6.3)
ENDING BALANCE (in shares) at Mar. 31, 2023 |  | 33,498,693 |  |  |  |
ENDING BALANCE at Mar. 31, 2023 | $ 505.2 | $ 0.3 | 232.4 | 527.5 |  | 34.3
ENDING BALANCE, Treasury Stock (in shares) at Mar. 31, 2023 |  |  |  |  | (5,123,656) |
ENDING BALANCE, Treasury Stock at Mar. 31, 2023 |  |  |  |  | $ (289.3) |
BEGINNING BALANCE (in shares) at Dec. 31, 2023 | 33,587,701 | 33,587,701 |  |  |  |
BEGINNING BALANCE at Dec. 31, 2023 | $ 670.3 | $ 0.3 | 244.7 | 693.8 |  | 33.7
BEGINING BALANCE, Treasury Stock (in shares) at Dec. 31, 2023 | (5,220,363) |  |  |  | (5,220,363) |
BEGINING BALANCE, Treasury Stock at Dec. 31, 2023 | $ (302.2) |  |  |  | $ (302.2) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] |  |  |  |  |  |
Net income | 55.9 |  |  | 55.9 |  |
Issuance of common stock awards to employees (in shares) |  | 70,629 |  |  |  |
Surrender of common stock awards (in shares) |  |  |  |  | (1,409) |
Surrender of common stock awards | (0.2) |  |  |  | $ (0.2) |
Share-based compensation expense | 3.8 |  | 3.8 |  |  |
Share-based compensation issued to directors | 0.2 |  | 0.2 |  |  |
Dividends declared | (55.5) |  |  | (55.5) |  |
Other comprehensive income (loss), net of tax | $ 4.7 |  |  |  |  | 4.7
ENDING BALANCE (in shares) at Mar. 31, 2024 | 33,658,330 | 33,658,330 |  |  |  |
ENDING BALANCE at Mar. 31, 2024 | $ 679.2 | $ 0.3 | $ 248.7 | $ 694.2 |  | $ 38.4
ENDING BALANCE, Treasury Stock (in shares) at Mar. 31, 2024 | (5,221,772) |  |  |  | (5,221,772) |
ENDING BALANCE, Treasury Stock at Mar. 31, 2024 | $ (302.4) |  |  |  | $ (302.4) |

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- Definition Amount allocated to previously issued common shares repurchased by the issuing entity and held in treasury. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 50 -Paragraph 4 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481520/505-30-50-4 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 505 -SubTopic 30 -Section 45 -Paragraph 1 -Publisher FASB -URI https://asc.fasb.org//1943274/2147481549/505-30-45-1 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.30) -Publisher FASB -URI https://asc.fasb.org//1943274/2147480566/210-10-S99-1 + Details
Name: | us-gaap_TreasuryStockCommonValue
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | instant