CONSOLIDATED STATEMENTS OF EQUITY - USD ($) $ in Millions	Total	Common Stock	Additional Paid-in Capital	Retained Earnings	Noncontrolling Interest
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Sep. 30, 2024	$ 1,595.1	$ 50.7	$ 665.2	$ 878.2	$ 1.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	16.5	0.0	0.0	16.5	0.0
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture	0.0	0.0	0.0	0.0	0.0
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	(0.1)	0.0	(0.1)	0.0	0.0
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	2.6	0.0	2.6	0.0	0.0
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Dec. 31, 2024	1,614.1	50.7	667.7	894.7	1.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Sep. 30, 2024	1,595.1	50.7	665.2	878.2	1.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	48.1
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2025	1,645.9	50.8	667.8	926.3	1.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2024	1,614.1	50.7	667.7	894.7	1.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	31.6	0.0	0.0	31.6	0.0
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture	0.1	0.1	0.0	0.0	0.0
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	(1.6)	0.0	(1.6)	0.0	0.0
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	1.7	0.0	1.7	0.0	0.0
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2025	1,645.9	50.8	667.8	926.3	1.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Sep. 30, 2025	1,768.9	50.8	671.0	1,046.1	1.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	15.4	0.0	0.0	15.4	0.0
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture	0.1	0.1	0.0	0.0	0.0
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	(0.5)	0.0	(0.5)	0.0	0.0
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	3.1	0.0	3.1	0.0	0.0
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Dec. 31, 2025	1,787.0	50.9	673.6	1,061.5	1.0
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Sep. 30, 2025	1,768.9	50.8	671.0	1,046.1	1.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	47.7
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2026	1,819.9	51.0	674.2	1,093.6	1.1
Stockholders' Equity, Including Portion Attributable to Noncontrolling Interest, Beginning Balance at Dec. 31, 2025	1,787.0	50.9	673.6	1,061.5	1.0
Net Income (Loss), Including Portion Attributable to Noncontrolling Interest	32.2	0.0	0.0	32.1	0.1
Shares Issued, Value, Share-Based Payment Arrangement, after Forfeiture	0.3	0.1	(0.2)	0.0	0.0
Share-Based Payment Arrangement, Decrease for Tax Withholding Obligation	(1.5)	0.0	(1.5)	0.0	0.0
APIC, Share-Based Payment Arrangement, Increase for Cost Recognition	1.9	0.0	1.9	0.0	0.0
Equity, Including Portion Attributable to Noncontrolling Interest, Ending Balance at Mar. 31, 2026	$ 1,819.9	$ 51.0	$ 674.2	$ 1,093.6	$ 1.1