Income Taxes - Narrative (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Income Tax Disclosure [Abstract]
Effective income tax rate (as a percent)	0.69%	0.20%	(0.92%)	(0.54%)
Deferred employer payroll taxes	$ 1.8		$ 1.8
Deferred employer payroll taxes, current	0.9		0.9
Deferred employer payroll taxes, noncurrent	$ 0.9		$ 0.9