Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2026	Sep. 30, 2025
Statement of Comprehensive Income [Abstract]
Net earnings	$ 1,125.2	$ 1,013.0
Other comprehensive income/(loss):
Currency translation adjustments	(9.9)	(15.5)
Unrealized net gains/(losses) on available-for-sale securities	(855.0)	215.7
Tax effect	193.4	(48.3)
Reclassification of realized net (gains)/losses on available-for-sale securities to net earnings	1.4	(1.5)
Tax effect	(0.3)	0.3
Unrealized net gains/(losses) on cash flow hedging activities	0.0	0.0
Tax effect	0.0	0.0
Amortization of unrealized net (gains)/losses on cash flow hedging activities	1.4	1.5
Tax effect	(0.3)	(0.4)
Reclassification of pension liability adjustment to net earnings	1.3	1.2
Tax effect	(0.3)	(0.3)
Other comprehensive income/(loss), net of tax	(668.3)	152.7
Comprehensive income	$ 456.9	$ 1,165.7