CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended
	Jun. 30, 2023	Jun. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 666.4	$ 507.2
Defined benefit plans:
Actuarial (losses) gains related to defined benefit pension plans, net of tax effect	(0.3)	4.0
Other comprehensive (loss) income, net of tax effect	(0.3)	4.0
Comprehensive income	$ 666.1	$ 511.2