Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2025	Jun. 30, 2024	Jun. 30, 2023
Income Statement [Abstract]
Revenues	$ 6,889.1	$ 6,506.8	$ 6,060.9
Operating expenses:
Cost of revenues	4,752.3	4,572.9	4,275.5
Selling, general and administrative expenses	948.2	916.8	849.0
Total operating expenses	5,700.6	5,489.7	5,124.5
Operating income	1,188.6	1,017.1	936.4
Interest expense, net	(122.7)	(138.1)	(135.5)
Other non-operating expenses, net	(7.1)	(1.7)	(6.0)
Earnings before income taxes	1,058.7	877.4	794.9
Provision for income taxes	219.2	179.3	164.3
Net earnings	$ 839.5	$ 698.1	$ 630.6
Basic earnings per share (in dollars per share)	$ 7.17	$ 5.93	$ 5.36
Diluted earnings per share (in dollars per share)	$ 7.10	$ 5.86	$ 5.30
Weighted-average shares outstanding:
Basic (in shares)	117.1	117.7	117.7
Diluted (in shares)	118.3	119.1	119.0