Stock-Based Compensation, Restricted Stock (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2019
Compensation Expense [Abstract]
Stock-based compensation expense	$ 6.3	$ 6.6	$ 7.9
Restricted Stock [Member]
Restricted Stock Activity [Roll Forward]
Non-vested balance, beginning (in shares)	0.5
Granted (in shares)	0.8
Vested (in shares)	(0.5)
Forfeited (in shares)	(0.1)
Non-vested balance, ending (in shares)	0.7	0.5
Weighted Average Price [Rollforward]
Non-vested balance, beginning (in dollars per share)	$ 14.48
Granted (in dollars per share)	7.53
Vested (in dollars per share)	9.64
Forfeited (in dollars per share)	13.40
Non-vested balance, ending (in dollars per share)	$ 10.05	$ 14.48
Compensation Expense [Abstract]
Stock-based compensation expense	$ 4.3	$ 4.5	4.3
Fair value of awards vesting	4.5	4.4	4.3
Unrecognized compensation costs	$ 6.1
Weighted average period recognized	2 years 8 months 12 days
Assumptions for Stock Awards Granted [Abstract]
Award vesting period	4 years
Restricted Stock [Member] | Tranche One [Member]
Assumptions for Stock Awards Granted [Abstract]
Annual vesting percentage	25.00%
Restricted Stock [Member] | Tranche Two [Member]
Assumptions for Stock Awards Granted [Abstract]
Annual vesting percentage	25.00%
Restricted Stock [Member] | Tranche Three [Member]
Assumptions for Stock Awards Granted [Abstract]
Annual vesting percentage	25.00%
Restricted Stock [Member] | Tranche Four [Member]
Assumptions for Stock Awards Granted [Abstract]
Annual vesting percentage	25.00%
Performance Stock Awards [Member]
Compensation Expense [Abstract]
Stock-based compensation expense	$ 1.1	$ 0.8	$ 2.4
Unrecognized compensation costs	$ 0.5
Weighted average period recognized	1 year
Assumptions for Stock Awards Granted [Abstract]
Award vesting period	3 years
Performance period	3 years
Period of time to average cash flow return on invested capital	3 years
Period of time to average revenue growth	3 years