Condensed Consolidated Statements of Shareholders' Equity - USD ($) shares in Millions, $ in Millions | Common Stock | Additional Paid In Capital | AOCI Attributable to Parent [Member] | Retained Earnings | Total |
Balance at the beginning of the period at Dec. 31, 2022 | $ 27.2 | $ 290.4 | $ (6.9) | $ 1,986.2 | $ 2,296.9 |
Balance (in shares) at Dec. 31, 2022 | 36.3 | | | | |
Increase (Decrease) in Shareholders' Equity | | | | | |
Net income | | | | 34 | 34 |
Other comprehensive income (loss), net of tax | | | 0.6 | | 0.6 |
Share-based compensation | | 4.6 | | | 4.6 |
Shares issued, net of shares withheld for employee taxes | $ 0.2 | (12.6) | | | (12.4) |
Shares issued, net of shares withheld for employee taxes (in shares) | 0.3 | | | | |
Shares repurchased | $ (0.5) | (2.7) | | (38.9) | (42.1) |
Shares repurchased (in shares) | (0.7) | | | | |
Dividends | | | | (11.3) | (11.3) |
Balance at the end of the period at Mar. 31, 2023 | $ 26.9 | 279.7 | (6.3) | 1,970 | 2,270.3 |
Balance (in shares) at Mar. 31, 2023 | 35.9 | | | | |
Balance at the beginning of the period at Dec. 31, 2022 | $ 27.2 | 290.4 | (6.9) | 1,986.2 | 2,296.9 |
Balance (in shares) at Dec. 31, 2022 | 36.3 | | | | |
Increase (Decrease) in Shareholders' Equity | | | | | |
Net income | | | | | 234.7 |
Other comprehensive income (loss), net of tax | | | | | (2.4) |
Balance at the end of the period at Sep. 30, 2023 | $ 26.2 | 289.1 | (9.3) | 2,084.3 | 2,390.3 |
Balance (in shares) at Sep. 30, 2023 | 34.9 | | | | |
Balance at the beginning of the period at Mar. 31, 2023 | $ 26.9 | 279.7 | (6.3) | 1,970 | 2,270.3 |
Balance (in shares) at Mar. 31, 2023 | 35.9 | | | | |
Increase (Decrease) in Shareholders' Equity | | | | | |
Net income | | | | 80.8 | 80.8 |
Other comprehensive income (loss), net of tax | | | (1.6) | | (1.6) |
Share-based compensation | | 5.2 | | | 5.2 |
Shares issued, net of shares withheld for employee taxes | | 0.1 | | | 0.1 |
Shares repurchased | $ (0.6) | (2.3) | | (39.5) | (42.4) |
Shares repurchased (in shares) | (0.6) | | | | |
Dividends | | | | (22.4) | (22.4) |
Balance at the end of the period at Jun. 30, 2023 | $ 26.3 | 282.7 | (7.9) | 1,988.9 | 2,290 |
Balance (in shares) at Jun. 30, 2023 | 35.3 | | | | |
Increase (Decrease) in Shareholders' Equity | | | | | |
Net income | | | | 119.9 | 119.9 |
Other comprehensive income (loss), net of tax | | | (1.4) | | (1.4) |
Share-based compensation | | 7.8 | | | 7.8 |
Shares issued, net of shares withheld for employee taxes | | (0.2) | | | (0.2) |
Shares repurchased | $ (0.1) | (1.2) | | (24.5) | (25.8) |
Shares repurchased (in shares) | (0.4) | | | | |
Balance at the end of the period at Sep. 30, 2023 | $ 26.2 | 289.1 | (9.3) | 2,084.3 | 2,390.3 |
Balance (in shares) at Sep. 30, 2023 | 34.9 | | | | |
Balance at the beginning of the period at Dec. 31, 2023 | $ 25.8 | 293.4 | (8.2) | 2,089.7 | 2,400.7 |
Balance (in shares) at Dec. 31, 2023 | 34.4 | | | | |
Increase (Decrease) in Shareholders' Equity | | | | | |
Net income | | | | 36.1 | 36.1 |
Other comprehensive income (loss), net of tax | | | (1.6) | | (1.6) |
Share-based compensation | | 5.7 | | | 5.7 |
Shares issued, net of shares withheld for employee taxes | $ 0.1 | (17.3) | | | (17.2) |
Shares issued, net of shares withheld for employee taxes (in shares) | 0.2 | | | | |
Shares repurchased | $ (0.3) | (1.6) | | (47) | (48.9) |
Shares repurchased (in shares) | (0.4) | | | | |
Equity interest in SSAT (see Note 4) | | | | 10.1 | 10.1 |
Dividends | | | | (11.1) | (11.1) |
Balance at the end of the period at Mar. 31, 2024 | $ 25.6 | 280.2 | (9.8) | 2,077.8 | 2,373.8 |
Balance (in shares) at Mar. 31, 2024 | 34.2 | | | | |
Balance at the beginning of the period at Dec. 31, 2023 | $ 25.8 | 293.4 | (8.2) | 2,089.7 | 2,400.7 |
Balance (in shares) at Dec. 31, 2023 | 34.4 | | | | |
Increase (Decrease) in Shareholders' Equity | | | | | |
Net income | | | | | 348.4 |
Other comprehensive income (loss), net of tax | | | | | (1.8) |
Shares repurchased | | | | | $ (169.2) |
Shares repurchased (in shares) | | | | | (1.4) |
Balance at the end of the period at Sep. 30, 2024 | $ 24.9 | 290.5 | (10) | 2,251.3 | $ 2,556.7 |
Balance (in shares) at Sep. 30, 2024 | 33.2 | | | | |
Balance at the beginning of the period at Mar. 31, 2024 | $ 25.6 | 280.2 | (9.8) | 2,077.8 | 2,373.8 |
Balance (in shares) at Mar. 31, 2024 | 34.2 | | | | |
Increase (Decrease) in Shareholders' Equity | | | | | |
Net income | | | | 113.2 | 113.2 |
Other comprehensive income (loss), net of tax | | | (0.4) | | (0.4) |
Share-based compensation | | 6.3 | | | 6.3 |
Shares issued, net of shares withheld for employee taxes | | 0.2 | | | 0.2 |
Shares repurchased | $ (0.4) | (2) | | (69.8) | (72.2) |
Shares repurchased (in shares) | (0.6) | | | | |
Dividends | | | | (22.4) | (22.4) |
Balance at the end of the period at Jun. 30, 2024 | $ 25.2 | 284.7 | (10.2) | 2,098.8 | 2,398.5 |
Balance (in shares) at Jun. 30, 2024 | 33.6 | | | | |
Increase (Decrease) in Shareholders' Equity | | | | | |
Net income | | | | 199.1 | 199.1 |
Other comprehensive income (loss), net of tax | | | 0.2 | | 0.2 |
Share-based compensation | | 7.1 | | | 7.1 |
Shares issued, net of shares withheld for employee taxes | | (0.1) | | | (0.1) |
Shares repurchased | $ (0.3) | (1.2) | | (46.6) | $ (48.1) |
Shares repurchased (in shares) | (0.4) | | | | (0.4) |
Balance at the end of the period at Sep. 30, 2024 | $ 24.9 | $ 290.5 | $ (10) | $ 2,251.3 | $ 2,556.7 |
Balance (in shares) at Sep. 30, 2024 | 33.2 | | | | |