Revenue Recognition - Change in Contract with Customer, Asset and Liability (Details) $ in Millions	12 Months Ended
	Mar. 31, 2020 USD ($)
Contract Assets
Contract assets, beginning balance	$ 2.6
Contract assets, additions	1.6
Contract assets, deductions	(3.7)
Contract assets, ending balance	0.5
Contract Liabilities
Contract liabilities, beginning balance	5.1
Contract liabilities, additions	21.4
Contract liabilities, deductions	(19.2)
Contract liabilities, ending balance	$ 7.3