Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Statement of Comprehensive Income [Abstract]
Net earnings	$ 4,079.7	$ 3,752.0	$ 3,412.0
Other comprehensive income/(loss):
Currency translation adjustments	89.0	(38.0)	13.4
Unrealized net gains/(losses) on available-for-sale securities	1,088.4	685.2	(500.3)
Tax effect	(250.7)	(162.2)	113.3
Reclassification of realized net losses on available-for-sale securities to net earnings	1.7	5.9	14.7
Tax effect	(0.3)	(1.3)	(3.3)
Unrealized losses on cash flow hedging activities	(15.6)	0.0	0.0
Tax effect	3.8	0.0	0.0
Amortization of unrealized losses on cash flow hedging activities	5.4	4.4	4.4
Tax effect	(1.3)	(1.1)	(1.1)
Pension net gains arising during the year	8.5	5.6	60.3
Tax effect	(2.1)	(1.1)	(13.3)
Reclassification of pension liability adjustment to net earnings	(2.4)	0.1	(0.4)
Tax effect	0.5	0.0	0.2
Other comprehensive income/(loss), net of tax	924.9	497.5	(312.1)
Comprehensive income	$ 5,004.6	$ 4,249.5	$ 3,099.9