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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($) $ in Millions	12 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net income	$ 1,285.5	$ 349.4	$ 570.6
Defined benefit plans:
Actuarial gains (losses) related to defined benefit pension plans, net of tax effect	6.9	(9.4)	1.4
Reclassification of realized transactions, net of tax effect	0.9	1.1	0.8
Change in net foreign currency translation adjustment	(2.2)	3.7	(1.8)
Other comprehensive income (loss), net of tax effect	5.6	(4.6)	0.4
Comprehensive income	$ 1,291.1	$ 344.8	$ 571.0

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