Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2023	Jun. 30, 2022	Jun. 30, 2021
Statement of Comprehensive Income [Abstract]
Net earnings	$ 3,412.0	$ 2,948.9	$ 2,598.5
Other comprehensive (loss)/income:
Currency translation adjustments	13.4	(127.4)	95.4
Unrealized net (losses)/gains on available-for-sale securities	(500.3)	(2,228.0)	(363.3)
Tax effect	113.3	503.7	82.6
Reclassification of net losses/(gains) on available-for-sale securities to net earnings	14.7	4.4	(11.3)
Tax effect	(3.3)	(1.0)	2.5
Unrealized (losses)/gains on cash flow hedging activities	0.0	0.0	(3.3)
Tax effect	0.0	0.0	0.8
Amortization of unrealized losses on cash flow hedging activities	4.4	4.4	3.8
Tax effect	(1.1)	(1.1)	(0.9)
Pension net (losses)/gains arising during the year	60.3	(229.8)	281.5
Tax effect	(13.3)	57.3	(69.0)
Reclassification of pension liability adjustment to net earnings	(0.4)	18.1	9.3
Tax effect	0.2	(4.9)	(2.7)
Other comprehensive (loss)/income, net of tax	(312.1)	(2,004.3)	25.4
Comprehensive income	$ 3,099.9	$ 944.6	$ 2,623.9