Segment Information - Schedule of Purchase Accounting and Related Adjustments (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2025	Mar. 31, 2024	Mar. 31, 2023
Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments:	$ 12.9	$ 17.1	$ 61.6
Direct Operating Expense | Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments:	0.0	0.0	0.7
General and Administrative Expense
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments:	8.7	12.0	55.2
General and Administrative Expense | Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments:	8.7	12.0	55.2
Amortization of recoupable portion of the purchase price	0.0	1.3	7.7
Depreciation and Amortization Expense | Corporate and Reconciling Items
Segment Reporting, Reconciling Item for Operating Profit (Loss) from Segment to Consolidated [Line Items]
Purchase accounting and related adjustments:	$ 4.2	$ 5.1	$ 5.7