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Stock-Based Compensation (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions		3 Months Ended		9 Months Ended
		Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2020	Dec. 31, 2019
Stock-Based Compensation [Abstract]
Stock-based compensation expense		$ 2.1	$ 0.8	$ 4.2	$ 5.2
Stock-Based Compensation [Abstract]
Unrecognized compensation expense		11.0		$ 11.0
Weighted-average remaining service period				2 years 9 months 18 days
Stock Options [Member]
Type and fair value of stock-based compensation awards granted [Abstract]
Options granted (in shares)				0.4	0.3
Fair value of options granted (in dollars per share)				$ 3.46	$ 5.56
Assumptions used in determining fair value of options [Abstract]
Expected life of awards				6 years 1 month 6 days	6 years 3 months 18 days
Risk-free interest rate				0.40%	2.20%
Expected volatility of the Company's stock				54.10%	39.20%
Expected dividend yield on the Company's stock				0.00%	0.00%
Stock-Based Compensation [Abstract]
Unrecognized compensation expense		2.3		$ 2.3
Weighted-average remaining service period				3 years
Restricted Stock Awards [Member]
Type and fair value of stock-based compensation awards granted [Abstract]
Stock granted (in shares)				0.6	0.3
Fair value of stock granted (in dollars per share)				$ 8.34	$ 13.26
Stock-Based Compensation [Abstract]
Unrecognized compensation expense		8.1		$ 8.1
Weighted-average remaining service period				2 years 10 months 24 days
Performance Stock Awards [Member]
Type and fair value of stock-based compensation awards granted [Abstract]
Stock granted (in shares)	[1]			0.0	0.3
Fair value of stock granted (in dollars per share)	[1]			$ 0	$ 13.26
Period of time to average cash flow return on invested capital				3 years
Period of time to average revenue growth				3 years
Performance period				3 years
Stock-Based Compensation [Abstract]
Unrecognized compensation expense		$ 0.6		$ 0.6
Weighted-average remaining service period				1 year 2 months 12 days
Unrestricted Stock Awards [Member]
Type and fair value of stock-based compensation awards granted [Abstract]
Stock granted (in shares)				0.2	0.1
Fair value of stock granted (in dollars per share)				$ 5.21	$ 14.50
[1] In lieu of performance-based stock awards, the Company granted performance cash awards to the LTIP participants in fiscal 2021. The performance metrics for the cash awards are based upon a target three-year average cash flow return on invested capital and a target three-year average revenue growth at the end of the three-year performance period ending March 31, 2023.  These performance metrics are the same as the metrics for the fiscal 2020 and 2019 performance-based stock awards.

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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