CONSOLIDATED STATEMENTS OF SHAREHOLDERS' EQUITY - USD ($) shares in Millions, $ in Millions	Common stock	Additional paid-in capital	Retained earnings	Accumulated other comprehensive loss	Treasury stock, at cost	Non-controlling interest	Total
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
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 income (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
Dividends declared or 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
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings							94.2
Other comprehensive income (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
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 income (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
Balance at Mar. 31, 2025	$ 35.3	310.8	843.0	(181.3)	(97.6)	8.0	$ 918.2
Balance (in shares) at Mar. 31, 2025	56.5						56.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 0.0	0.0	51.2	0.0	0.0	0.5	$ 51.7
Other comprehensive income (loss)	0.0	0.0	0.0	49.4	0.0	0.5	49.9
Stock options and awards	$ 0.1	0.4	0.0	0.0	0.0	0.0	0.5
Stock options and awards (in shares)	0.1
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(5.1)	0.0	(5.1)
Stock-based compensation expense	0.0	5.3	0.0	0.0	0.0	0.0	5.3
Dividends declared or paid to noncontrolling interest	0.0	0.0	0.0	0.0	0.0	(1.8)	(1.8)
Balance at Jun. 30, 2025	$ 35.4	316.5	894.2	(131.9)	(102.7)	7.2	1,018.7
Balance (in shares) at Jun. 30, 2025	56.6
Balance at Mar. 31, 2025	$ 35.3	310.8	843.0	(181.3)	(97.6)	8.0	$ 918.2
Balance (in shares) at Mar. 31, 2025	56.5						56.5
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings							$ 96.5
Other comprehensive income (loss)							44.1
Balance at Sep. 30, 2025	$ 35.5	320.4	938.6	(137.7)	(103.3)	7.6	$ 1,061.1
Balance (in shares) at Sep. 30, 2025	56.8						56.8
Balance at Jun. 30, 2025	$ 35.4	316.5	894.2	(131.9)	(102.7)	7.2	$ 1,018.7
Balance (in shares) at Jun. 30, 2025	56.6
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	$ 0.0	0.0	44.4	0.0	0.0	0.4	44.8
Other comprehensive income (loss)	0.0	0.0	0.0	(5.8)	0.0	0.0	(5.8)
Stock options and awards	$ 0.1	1.8	0.0	0.0	0.0	0.0	1.9
Stock options and awards (in shares)	0.2
Purchase of treasury stock	$ 0.0	0.0	0.0	0.0	(0.6)	0.0	(0.6)
Stock-based compensation expense	0.0	2.1	0.0	0.0	0.0	0.0	2.1
Balance at Sep. 30, 2025	$ 35.5	$ 320.4	$ 938.6	$ (137.7)	$ (103.3)	$ 7.6	$ 1,061.1
Balance (in shares) at Sep. 30, 2025	56.8						56.8