Statements of Consolidated Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Consolidated Statement of Comprehensive Income [Abstract]
Net earnings	$ 467.5	$ 510.9	$ 869.0	$ 879.6
Other comprehensive income/loss:
Currency translation adjustments	4.1	(55.0)	46.6	(44.2)
Unrealized net losses on available-for-sale securities	(147.3)	(413.3)	(160.2)	(484.7)
Tax effect	53.1	145.4	56.6	171.6
Reclassification of net losses/(gains) on available-for-sale securities to net earnings	1.0	(1.3)	1.1	(1.4)
Tax effect	(0.4)	0.6	(0.4)	0.6
Reclassification of pension liability adjustment to net earnings	2.3	5.1	4.6	10.2
Tax effect	(0.8)	(1.8)	(1.7)	(3.7)
Other comprehensive loss, net of tax	(88.0)	(320.3)	(53.4)	(351.6)
Comprehensive income	$ 379.5	$ 190.6	$ 815.6	$ 528.0