Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Statement of Comprehensive Income [Abstract]
Net earnings	$ 963.2	$ 878.4	$ 1,919.5	$ 1,737.8
Other comprehensive income/(losses):
Currency translation adjustments	(101.0)	53.9	(51.8)	9.3
Unrealized net (losses)/gains on available-for-sale securities	(423.8)	860.5	440.5	709.9
Tax effect	94.2	(194.9)	(103.6)	(164.8)
Reclassification of realized net losses on available-for-sale securities to net earnings	0.6	2.0	0.8	4.0
Tax effect	(0.1)	(0.5)	(0.1)	(1.0)
Unrealized loss on cash flow hedging activities	0.0	0.0	(12.5)	0.0
Tax effect	0.0	0.0	3.1	0.0
Amortization of unrealized losses on cash flow hedging activities	1.4	1.1	2.5	2.2
Tax effect	(0.3)	(0.2)	(0.6)	(0.5)
Reclassification of pension liability adjustment to net earnings	0.7	0.9	1.8	1.9
Tax effect	(0.2)	(0.2)	(0.5)	(0.4)
Other comprehensive (loss)/income, net of tax	(428.5)	722.6	279.6	560.6
Comprehensive income	$ 534.7	$ 1,601.0	$ 2,199.1	$ 2,298.4