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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2025	Sep. 30, 2024	Sep. 30, 2025	Sep. 30, 2024
Statement of Comprehensive Income [Abstract]
Net income	$ 41.7	$ 78.4	$ 23.1	$ 207.7
Components of other comprehensive income (loss):
Actuarial gains (losses) related to defined benefit pension plans, net of tax effect	0.2	(4.1)	(4.5)	(4.3)
Other comprehensive income (loss), net of tax effect	0.2	(4.1)	(4.5)	(4.3)
Comprehensive income	$ 41.9	$ 74.3	$ 18.6	$ 203.4

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