Restructuring and Other - Schedule of Restructuring and Other and Other Unusual Charges or Benefits (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Restructuring Cost and Reserve [Line Items]
Restructuring and other	$ 7.2	$ 4.9	$ 34.9	$ 9.0
Total restructuring and other and other unusual charges not included in restructuring and other	12.4	4.4	43.3	8.6
Insurance recoveries	0.0	0.5	2.1	0.5
Corporate and Reconciling Items
Restructuring Cost and Reserve [Line Items]
Restructuring and other	7.2	4.9	34.9	9.0
COVID-19 related (charges) benefit included in direct operating expense	0.0	(0.5)	(2.1)	(0.4)
Unallocated rent cost included in direct operating expense	5.2	0.0	10.5	0.0
Direct Operating Expense
Restructuring Cost and Reserve [Line Items]
COVID-19 related (charges) benefit included in direct operating expense	0.0	(0.5)	(2.1)	(0.4)
Other Impairments
Restructuring Cost and Reserve [Line Items]
Restructuring and other	0.5	0.0	18.5	0.0
Severance
Restructuring Cost and Reserve [Line Items]
Restructuring and other	1.1	1.0	4.1	3.5
Transaction and Other Costs
Restructuring Cost and Reserve [Line Items]
Restructuring and other	$ 5.6	$ 3.9	$ 12.3	$ 5.5