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- Definition

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Amount of expense for award under share-based payment arrangement. Excludes amount capitalized.

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Number of warrants or rights outstanding.

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Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Weighted-average period over which cost not yet recognized is expected to be recognized for award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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The number of equity-based payment instruments, excluding stock (or unit) options, that were forfeited during the reporting period.

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The number of grants made during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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Fair value of share-based awards for which the grantee gained the right by satisfying service and performance requirements, to receive or retain shares or units, other instruments, or cash.

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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STOCK‐BASED COMPENSATION - Narrative (Details) - USD ($) $ / shares in Units, $ in Millions	1 Months Ended		3 Months Ended		12 Months Ended
	Aug. 31, 2025	Feb. 29, 2024	Mar. 31, 2026	Mar. 31, 2025	Dec. 31, 2023
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Intrinsic value of stock options exercised			$ 0.4	$ 2.3
Stock-based compensation expense			31.0	$ 5.5
Warrants exercised (in shares)				276,657
Warrants exercised, intrinsic value				$ 10.7
Income tax benefit related to stock-based compensation expense			$ 0.0	$ 1.4
Warrants for Class A Common Stock
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Warrants outstanding (in shares)			0
RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)			$ 7.12	$ 38.60
Fair value of RSUs vested			$ 15.8	$ 0.1
Granted (in shares)			12,312,860
Awards cancelled or forfeited (in shares)			227,268
Stock Price Target Performance RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)		462,500			7,116,935
Awards cancelled or forfeited (in shares)	462,500
Stock Price Target Performance RSUs \| 2023 Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 3.3	0.0
Unrecognized stock-based compensation			$ 3.5
Unrecognized share-based compensation cost, period of recognition			6 months
Stock Price Target Performance RSUs \| February 2024 Grants
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense			$ 0.0	2.1
GMS Performance Restricted Stock Units
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					4,023,387
Unrecognized stock-based compensation			$ 32.9
Unrecognized share-based compensation cost, period of recognition			2 years 3 months 18 days
GMS Performance RSUs with market conditions
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in shares)					3,093,548
Stock-based compensation expense			$ 4.2	0.0
Other RSUs
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Granted (in dollars per share)			$ 7.12
Granted (in shares)			12,312,860
Stock-based compensation expense			$ 30.2	0.0
Unrecognized stock-based compensation			$ 172.8
Unrecognized share-based compensation cost, period of recognition			2 years 6 months
Awards cancelled or forfeited (in shares)			227,268
Warrant
Share-based Compensation Arrangement by Share-based Payment Award [Line Items]
Stock-based compensation expense				$ 3.0