CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Common Stock [Member]	Additional Paid-in Capital [Member]	Retained Earnings [Member]	Accumulated Other Comprehensive Loss [Member]	Treasury Stock, at Cost [Member]	Non-controlling Interest [Member]	Total
Balance at Mar. 31, 2023	$ 34.6	$ 270.8	$ 497.5	$ (161.1)	$ (49.0)	$ 6.8	$ 599.6
Balance (in shares) at Mar. 31, 2023	55.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 0.0	0.0	44.8	0.0	0.0	0.5	45.3
Other comprehensive loss	0.0	0.0	0.0	(0.5)	0.0	(0.2)	(0.7)
Stock options and awards	$ 0.1	0.4	0.0	0.0	0.0	0.0	0.5
Stock options and awards (in shares)	0.2
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(1.2)	0.0	(1.2)
Stock-based compensation expense	0.0	1.5	0.0	0.0	0.0	0.0	1.5
Dividend paid to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(0.5)	(0.5)
Balance at Jun. 30, 2023	$ 34.7	272.7	542.3	(161.6)	(50.2)	6.6	644.5
Balance (in shares) at Jun. 30, 2023	55.6
Balance at Mar. 31, 2023	$ 34.6	270.8	497.5	(161.1)	(49.0)	6.8	599.6
Balance (in shares) at Mar. 31, 2023	55.4
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings							92.2
Other comprehensive loss							(12.8)
Balance at Sep. 30, 2023	$ 34.8	276.4	588.8	(173.7)	(59.3)	7.0	674.0
Balance (in shares) at Sep. 30, 2023	55.7
Balance at Jun. 30, 2023	$ 34.7	272.7	542.3	(161.6)	(50.2)	6.6	644.5
Balance (in shares) at Jun. 30, 2023	55.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 0.0	0.0	46.5	0.0	0.0	0.4	46.9
Other comprehensive loss	0.0	0.0	0.0	(12.1)	0.0	0.0	(12.1)
Stock options and awards	$ 0.1	0.6	0.0	0.0	0.0	0.0	0.7
Stock options and awards (in shares)	0.1
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(9.1)	0.0	(9.1)
Stock-based compensation expense	0.0	3.1	0.0	0.0	0.0	0.0	3.1
Balance at Sep. 30, 2023	$ 34.8	276.4	588.8	(173.7)	(59.3)	7.0	674.0
Balance (in shares) at Sep. 30, 2023	55.7
Balance at Mar. 31, 2024	$ 35.0	283.7	659.0	(163.4)	(66.7)	7.9	$ 755.5
Balance (in shares) at Mar. 31, 2024	56.1						56.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 0.0	0.0	47.3	0.0	0.0	0.5	$ 47.8
Other comprehensive loss	0.0	0.0	0.0	(6.1)	0.0	(0.1)	(6.2)
Stock options and awards	$ 0.1	0.0	0.0	0.0	0.0	0.0	0.1
Stock options and awards (in shares)	0.1
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(4.7)	0.0	(4.7)
Stock-based compensation expense	0.0	4.2	0.0	0.0	0.0	0.0	4.2
Dividend paid to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(0.4)	(0.4)
Balance at Jun. 30, 2024	$ 35.1	287.9	706.3	(169.5)	(71.4)	7.9	796.3
Balance (in shares) at Jun. 30, 2024	56.2
Balance at Mar. 31, 2024	$ 35.0	283.7	659.0	(163.4)	(66.7)	7.9	$ 755.5
Balance (in shares) at Mar. 31, 2024	56.1						56.1
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings							$ 94.2
Other comprehensive loss							15.9
Balance at Sep. 30, 2024	$ 35.2	293.5	752.4	(147.8)	(74.5)	8.6	$ 867.4
Balance (in shares) at Sep. 30, 2024	56.3						56.3
Balance at Jun. 30, 2024	$ 35.1	287.9	706.3	(169.5)	(71.4)	7.9	$ 796.3
Balance (in shares) at Jun. 30, 2024	56.2
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 0.0	0.0	46.1	0.0	0.0	0.3	46.4
Other comprehensive loss	0.0	0.0	0.0	21.7	0.0	0.4	22.1
Stock options and awards	$ 0.1	0.0	0.0	0.0	0.0	0.0	0.1
Stock options and awards (in shares)	0.1
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(3.1)	0.0	(3.1)
Stock-based compensation expense	0.0	5.6	0.0	0.0	0.0	0.0	5.6
Balance at Sep. 30, 2024	$ 35.2	$ 293.5	$ 752.4	$ (147.8)	$ (74.5)	$ 8.6	$ 867.4
Balance (in shares) at Sep. 30, 2024	56.3						56.3