Condensed Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2022	Dec. 31, 2021
Income Statement [Abstract]
Revenues	$ 1,292.9	$ 1,259.6	$ 2,576.2	$ 2,452.5
Operating expenses:
Cost of revenues	988.2	978.4	1,978.7	1,892.5
Selling, general and administrative expenses	196.8	212.3	402.1	387.8
Total operating expenses	1,185.0	1,190.7	2,380.8	2,280.3
Operating income	107.9	68.9	195.4	172.1
Interest expense, net	(34.1)	(21.4)	(61.0)	(44.0)
Other non-operating income (expenses), net	(1.9)	4.4	(7.1)	2.0
Earnings before income taxes	71.9	51.9	127.3	130.1
Provision for income taxes	14.4	4.7	19.3	15.7
Net earnings	$ 57.5	$ 47.2	$ 108.0	$ 114.4
Basic earnings per share (in dollars per share)	$ 0.49	$ 0.40	$ 0.92	$ 0.98
Diluted earnings per share (in dollars per share)	$ 0.48	$ 0.40	$ 0.91	$ 0.97
Weighted-average shares outstanding:
Basic (in shares)	117.7	116.6	117.6	116.4
Diluted (in shares)	118.9	118.7	118.9	118.5