Condensed Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2020
Income Statement [Abstract]
Revenues	$ 1,259.6	$ 1,054.9	$ 2,452.5	$ 2,072.3
Operating expenses:
Cost of revenues	978.4	806.5	1,892.5	1,593.5
Selling, general and administrative expenses	212.3	169.0	387.8	320.7
Total operating expenses	1,190.7	975.5	2,280.3	1,914.3
Operating income	68.9	79.5	172.1	158.1
Interest expense, net	(21.4)	(11.1)	(44.0)	(25.6)
Other non-operating income, net	4.4	1.0	2.0	10.5
Earnings before income taxes	51.9	69.4	130.1	143.0
Provision for income taxes	4.7	13.1	15.7	20.9
Net earnings	$ 47.2	$ 56.3	$ 114.4	$ 122.1
Basic earnings per share (in dollars per share)	$ 0.40	$ 0.49	$ 0.98	$ 1.06
Diluted earnings per share (in dollars per share)	$ 0.40	$ 0.48	$ 0.97	$ 1.04
Weighted-average shares outstanding:
Basic (in shares)	116.6	115.7	116.4	115.5
Diluted (in shares)	118.7	117.8	118.5	117.6