Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Revenues	$ 4,993.7	$ 4,529.0	$ 4,362.2
Operating expenses:
Cost of revenues	3,570.8	3,265.1	3,131.9
Selling, general and administrative expenses	744.3	639.0	577.5
Total operating expenses	4,315.0	3,904.1	3,709.5
Operating income	678.7	624.9	652.7
Interest expense, net	(55.2)	(58.8)	(41.8)
Other non-operating income (expenses), net	72.7	13.4	(3.7)
Total	696.2	579.5	607.3
Provision for income taxes	148.7	117.0	125.2
Net earnings	$ 547.5	$ 462.5	$ 482.1
Basic earnings per share (in dollars per share)	$ 4.73	$ 4.03	$ 4.16
Diluted earnings per share (in dollars per share)	$ 4.65	$ 3.95	$ 4.06
Weighted-average shares outstanding:
Basic (in shares)	115.7	114.7	115.9
Diluted (in shares)	117.8	117.0	118.8