Condensed Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2024	Dec. 31, 2023
Income Statement [Abstract]
Revenues	$ 1,589.2	$ 1,405.0	$ 3,012.1	$ 2,836.0
Operating expenses:
Cost of revenues	1,145.8	1,057.2	2,220.8	2,132.5
Selling, general and administrative expenses	232.8	223.4	446.1	430.8
Total operating expenses	1,378.5	1,280.6	2,667.0	2,563.2
Operating income	210.7	124.4	345.1	272.8
Interest expense, net	(32.7)	(36.3)	(65.0)	(69.7)
Other non-operating expenses, net	(1.9)	(0.4)	(3.8)	(2.6)
Earnings before income taxes	176.0	87.6	276.3	200.5
Provision for income taxes	33.6	17.4	54.1	39.4
Net earnings	$ 142.4	$ 70.3	$ 222.2	$ 161.2
Basic earnings per share (in dollars per share)	$ 1.22	$ 0.60	$ 1.90	$ 1.37
Diluted earnings per share (in dollars per share)	$ 1.20	$ 0.59	$ 1.88	$ 1.35
Weighted-average shares outstanding:
Basic (in shares)	117.1	117.7	117.0	117.8
Diluted (in shares)	118.3	119.1	118.2	119.1