Condensed Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2026	Mar. 31, 2025	Mar. 31, 2026	Mar. 31, 2025
Income Statement [Abstract]
Revenues	$ 1,953.6	$ 1,811.7	$ 5,256.9	$ 4,823.7
Operating expenses:
Cost of revenues	1,326.7	1,235.9	3,733.8	3,456.7
Selling, general and administrative expenses	267.4	230.9	768.8	677.1
Total operating expenses	1,594.1	1,466.8	4,502.6	4,133.8
Operating income	359.5	344.9	754.3	689.9
Interest expense, net	(25.1)	(31.1)	(73.1)	(96.1)
Other non-operating income (expenses), net	6.2	(2.8)	242.7	(6.6)
Earnings before income taxes	340.6	310.9	923.9	587.2
Provision for income taxes	64.3	67.8	197.7	121.9
Net earnings	$ 276.3	$ 243.1	$ 726.2	$ 465.3
Basic earnings per share (in dollars per share)	$ 2.38	$ 2.07	$ 6.22	$ 3.97
Diluted earnings per share (in dollars per share)	$ 2.36	$ 2.05	$ 6.18	$ 3.93
Weighted-average shares outstanding:
Basic (in shares)	116.3	117.2	116.7	117.1
Diluted (in shares)	117.0	118.5	117.6	118.3