Share-Based and Unit-Based Compensation - Narrative (Details) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended		12 Months Ended
	Jul. 29, 2025 qtr $ / shares shares	Oct. 15, 2021 shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Sep. 30, 2025 USD ($) shares	Sep. 30, 2024 USD ($) shares	Dec. 31, 2024 USD ($) shares	Jun. 17, 2025 shares	May 31, 2024 shares	Dec. 31, 2023 shares	Jun. 06, 2023 shares	Oct. 14, 2021 shares
Share-based Payment Arrangement, Tranche Two | Opco
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Share-based Payment Arrangement, Tranche Three | Opco
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Share-based Payment Arrangement, Tranche One | Opco
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage		33.33%
Deferred Compensation, Share-based Payments
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Number of participation units outstanding (in shares)		1,197,250										10,811,502
Cash payments for settlement of vested participation units | $					$ 0.0	$ 0.0
RSUs and PSUs (treasury stock)
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					2,726,000	1,265,000
Unrecognized compensation expense | $			$ 13.0		$ 13.0		$ 11.7
Period to recognize unrecognized compensation expense					11 months 8 days		1 year 4 months 9 days
Accelerated costs | $			$ 3.2	$ 0.0	$ 5.1	$ 4.9
Shares outstanding (in shares)			2,750,000	1,274,000	2,750,000	1,274,000	1,421,000			521,000
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			44,220	15,756	932,101	1,044,308
Share-Based Payment Arrangement, Expense | $			$ 4.5	$ 2.1	$ 10.0	$ 11.7
PSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)			0	221,065	1,793,873	221,065
Share-Based Payment Arrangement, Expense | $			$ 3.3	$ 0.2	$ 6.5	$ 0.5
Percentage of target units earned					200.00%
PSUs | Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					33.33%
PSUs | Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					33.33%
PSUs | Share-based Payment Arrangement, Tranche One
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Vesting percentage					33.33%
PSUs | Minimum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target units earned					0.00%
PSUs | Maximum
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Percentage of target units earned					150.00%
Restricted Stock Units (RSUs) and Performance Stock Units (PSUs), Andy Main
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Accelerated costs | $			$ 3.2		$ 3.2
Preferred Incentive Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Shares outstanding (in shares)												76,475,000
Common Incentive Units [Member]
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					0	0
Shares outstanding (in shares)		17,473,362	283,000	304,000	283,000	304,000	287,000			309,000		23,219,745
Employee Stock Option
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Term of exercise (in quarters) | qtr	8
Share-Based Compensation Arrangement By Share-Based Payment Award, Number Of Shares Authorized, Shares	2,000,000
Share-Based Compensation Arrangement By Share-Based Payment Award, Exercise Price | $ / shares	$ 10.00
Performance Stock Units (PSUs), Mr. Naheta
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					1,607,717
Restricted Stock Units (RSUs), Mr. Naheta
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					11,426
2021 Omnibus Incentive Plan
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Common stock reserved for future issuance (in shares)		1,032,677						4,014,121	3,034,920
Increase in common stock reserved for future issuance (in shares)								979,201	938,625		1,063,618
Opco Plan | Share-based Payment Arrangement, Tranche Two
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		1 year
Opco Plan | Share-based Payment Arrangement, Tranche Three
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Award vesting period		2 years