Significant Accounting Policies, Trade Accounts Receivable (Details) - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2018
Trade accounts receivable [Abstract]
Trade receivables, allowance for doubtful accounts	$ (1.9)	$ (1.6)
Trade receivables sold without recourse	75.4	85.1	$ 65.8
Loss on the sale of accounts receivables	$ (0.5)	$ (0.6)	$ (0.4)