Condensed Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2022	Mar. 31, 2021	Mar. 31, 2022	Mar. 31, 2021
Income Statement [Abstract]
Revenues	$ 1,533.7	$ 1,389.8	$ 3,986.2	$ 3,462.1
Operating expenses:
Cost of revenues	1,077.6	960.5	2,970.1	2,554.1
Selling, general and administrative expenses	210.1	190.0	597.9	510.8
Total operating expenses	1,287.7	1,150.6	3,568.0	3,064.8
Operating income	246.0	239.2	418.2	397.3
Interest expense, net	(20.0)	(11.8)	(64.0)	(37.3)
Other non-operating expense, net	(2.7)	(10.6)	(0.7)	(0.1)
Earnings before income taxes	223.3	216.9	353.4	359.8
Provision for income taxes	46.8	51.9	62.4	72.7
Net earnings	$ 176.6	$ 165.0	$ 291.0	$ 287.1
Basic earnings per share (in dollars per share)	$ 1.51	$ 1.42	$ 2.50	$ 2.48
Diluted earnings per share (in dollars per share)	$ 1.49	$ 1.40	$ 2.46	$ 2.44
Weighted-average shares outstanding:
Basic (in shares)	116.8	115.8	116.5	115.6
Diluted (in shares)	118.6	118.0	118.5	117.7