Condensed Consolidated Statements of Stockholders' Equity - USD ($) shares in Millions, $ in Millions | Total | Common stock | Paid-in capital | Retained earnings (deficit) | Accumulated other comprehensive income |
Common stock outstanding, at beginning of period (shares) at Sep. 30, 2022 | | 176.1 | | | |
Balance at beginning of period at Sep. 30, 2022 | $ 306.6 | $ 1.8 | $ 44.1 | $ 282 | $ (21.3) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | |
Net income | 81.9 | | | 81.9 | |
Dividends paid | (21.8) | | 0.1 | (21.9) | |
Stock-based compensation, net of issuances (in shares) | | 0.3 | | | |
Stock-based compensation, net of issuances | (3.4) | | (3.4) | | |
Repurchases of common stock (shares) | | (2.9) | | | |
Repurchases of common stock | (87.5) | $ (0.1) | | (87.4) | |
Other comprehensive income, net of tax | 13.5 | | | | 13.5 |
Common stock outstanding, at end of period (shares) at Dec. 31, 2022 | | 173.5 | | | |
Balance at end of period at Dec. 31, 2022 | 289.3 | $ 1.7 | 40.8 | 254.6 | (7.8) |
Common stock outstanding, at beginning of period (shares) at Sep. 30, 2022 | | 176.1 | | | |
Balance at beginning of period at Sep. 30, 2022 | 306.6 | $ 1.8 | 44.1 | 282 | (21.3) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | |
Net income | 1,370.8 | | | | |
Other comprehensive income, net of tax | 38.3 | | | | |
Common stock outstanding, at end of period (shares) at Jun. 30, 2023 | | 138.7 | | | |
Balance at end of period at Jun. 30, 2023 | 285.4 | $ 1.4 | 44.8 | 222.2 | 17 |
Common stock outstanding, at beginning of period (shares) at Dec. 31, 2022 | | 173.5 | | | |
Balance at beginning of period at Dec. 31, 2022 | 289.3 | $ 1.7 | 40.8 | 254.6 | (7.8) |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | |
Net income | 1,227.3 | | | 1,227.3 | |
Stock-based compensation, net of issuances (in shares) | | 0.1 | | | |
Stock-based compensation, net of issuances | 1.8 | | 1.8 | | |
Repurchases of common stock (shares) | | (4.9) | | | |
Repurchases of common stock | (171.7) | | | (171.7) | |
Other comprehensive income, net of tax | 25.7 | | | | 25.7 |
Common stock outstanding, at end of period (shares) at Mar. 31, 2023 | | 168.7 | | | |
Balance at end of period at Mar. 31, 2023 | 1,372.4 | $ 1.7 | 42.6 | 1,310.2 | 17.9 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | |
Net income | 61.6 | | | 61.6 | |
Stock-based compensation, net of issuances (in shares) | | 0.1 | | | |
Stock-based compensation, net of issuances | 2.2 | | 2.2 | | |
Repurchases of common stock (shares) | | (30.1) | | | |
Repurchases of common stock | (1,149.9) | $ (0.3) | | (1,149.6) | |
Other comprehensive income, net of tax | (0.9) | | | | (0.9) |
Common stock outstanding, at end of period (shares) at Jun. 30, 2023 | | 138.7 | | | |
Balance at end of period at Jun. 30, 2023 | $ 285.4 | $ 1.4 | 44.8 | 222.2 | 17 |
Common stock outstanding, at beginning of period (shares) at Sep. 30, 2023 | 134.8 | 134.8 | | | |
Balance at beginning of period at Sep. 30, 2023 | $ 203.2 | $ 1.3 | 48 | 140.7 | 13.2 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | |
Net income | 31.9 | | | 31.9 | |
Stock-based compensation, net of issuances (in shares) | | 0.2 | | | |
Stock-based compensation, net of issuances | (1.7) | | (1.7) | | |
Repurchases of common stock (shares) | | (5.4) | | | |
Repurchases of common stock | (172.8) | | | (172.8) | |
Other comprehensive income, net of tax | 4.2 | | | | 4.2 |
Common stock outstanding, at end of period (shares) at Dec. 31, 2023 | | 129.6 | | | |
Balance at end of period at Dec. 31, 2023 | $ 64.8 | $ 1.3 | 46.3 | (0.2) | 17.4 |
Common stock outstanding, at beginning of period (shares) at Sep. 30, 2023 | 134.8 | 134.8 | | | |
Balance at beginning of period at Sep. 30, 2023 | $ 203.2 | $ 1.3 | 48 | 140.7 | 13.2 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | |
Net income | 119.2 | | | | |
Other comprehensive income, net of tax | $ (3.2) | | | | |
Common stock outstanding, at end of period (shares) at Jun. 30, 2024 | 128.9 | 128.9 | | | |
Balance at end of period at Jun. 30, 2024 | $ 106.5 | $ 1.3 | 48.9 | 46.3 | 10 |
Common stock outstanding, at beginning of period (shares) at Dec. 31, 2023 | | 129.6 | | | |
Balance at beginning of period at Dec. 31, 2023 | 64.8 | $ 1.3 | 46.3 | (0.2) | 17.4 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | |
Net income | 41.4 | | | 41.4 | |
Stock-based compensation, net of issuances (in shares) | | 0.2 | | | |
Stock-based compensation, net of issuances | (1) | | (1) | | |
Repurchases of common stock (shares) | | (1) | | | |
Repurchases of common stock | (40.8) | | | (40.8) | |
Other comprehensive income, net of tax | (4.3) | | | | (4.3) |
Common stock outstanding, at end of period (shares) at Mar. 31, 2024 | | 128.8 | | | |
Balance at end of period at Mar. 31, 2024 | 60.1 | $ 1.3 | 45.3 | 0.4 | 13.1 |
Increase (Decrease) in Stockholders' Equity [Roll Forward] | | | | | |
Net income | 45.9 | | | 45.9 | |
Stock-based compensation, net of issuances (in shares) | | 0.1 | | | |
Stock-based compensation, net of issuances | 3.6 | | 3.6 | | |
Other comprehensive income, net of tax | $ (3.1) | | | | (3.1) |
Common stock outstanding, at end of period (shares) at Jun. 30, 2024 | 128.9 | 128.9 | | | |
Balance at end of period at Jun. 30, 2024 | $ 106.5 | $ 1.3 | $ 48.9 | $ 46.3 | $ 10 |