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CONDENSED CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2023	Sep. 30, 2022
Statement of Comprehensive Income [Abstract]
Net income	$ 666.6	$ 546.2	$ 1,333.0	$ 1,053.4
Defined benefit plans:
Actuarial gains related to defined benefit pension plans, net of tax effect	1.6	5.1	1.3	9.1
Change in net foreign currency translation adjustment	0.0	(0.1)	0.0	(0.1)
Other comprehensive income, net of tax effect	1.6	5.0	1.3	9.0
Comprehensive income	$ 668.2	$ 551.2	$ 1,334.3	$ 1,062.4

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