CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net income	$ 129.3	$ 666.4
Components of other comprehensive loss:
Actuarial losses related to defined benefit pension plans, net of tax effect	(0.2)	(0.3)
Other comprehensive loss, net of tax effect	(0.2)	(0.3)
Comprehensive income	$ 129.1	$ 666.1