Segment Information - Schedule of Reconciliation of Total Segment Profit to the Company's Loss Before Income Taxes (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Segment Reporting Information [Line Items]
Company’s total segment profit	$ 144.5	$ 108.5	$ 268.5	$ 331.2
Adjusted depreciation and amortization	(3.4)	(1.8)	(10.1)	(7.1)
Restructuring and other	(40.9)	(52.5)	(75.8)	(61.5)
Adjusted share-based compensation expense	(14.3)	(17.2)	(42.2)	(46.3)
Operating income	49.6	7.3	30.5	120.1
Interest expense	(58.5)	(55.5)	(180.1)	(157.1)
Interest and other income	3.1	1.7	11.4	6.9
Other gains (losses), net	10.1	(0.6)	(5.2)	(14.3)
Loss on extinguishment of debt	(0.3)	0.0	(1.8)	0.0
Gain on investments, net	0.0	4.4	0.0	2.7
Equity interests income	7.6	4.2	8.5	5.7
Income (loss) before income taxes	11.6	(38.5)	(136.7)	(36.0)
Operating Segments
Segment Reporting Information [Line Items]
Company’s total segment profit	144.5	108.5	268.5	331.2
Corporate
Segment Reporting Information [Line Items]
Corporate general and administrative expenses	(28.4)	(25.2)	(87.6)	(76.2)
Corporate and Reconciling Items
Segment Reporting Information [Line Items]
Adjusted depreciation and amortization	(3.4)	(1.8)	(10.1)	(7.1)
Restructuring and other	(40.9)	(52.5)	(75.8)	(61.5)
COVID-19 related benefit (charges) included in direct operating expense	0.0	0.0	2.1	0.5
Content charges	0.0	(0.3)	0.0	(1.1)
Unallocated rent cost included in direct operating expense	(4.1)	0.0	(14.6)	0.0
Adjusted share-based compensation expense	(14.3)	(17.2)	(42.2)	(46.3)
Purchase accounting and related adjustments	$ (3.8)	$ (4.2)	$ (9.8)	$ (19.4)