Condensed Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Income Statement [Abstract]
Revenues	$ 1,017.4	$ 948.6
Operating expenses:
Cost of revenues	787.1	727.5
Selling, general and administrative expenses	151.7	148.0
Total operating expenses	938.8	875.4
Operating income	78.6	73.1
Interest expense, net	(14.4)	(13.1)
Other non-operating income (expenses), net	9.5	3.8
Earnings before income taxes	73.6	63.8
Provision for income taxes	7.8	7.9
Net earnings	$ 65.8	$ 55.9
Basic earnings per share (in dollars per share)	$ 0.57	$ 0.49
Diluted earnings per share (in dollars per share)	$ 0.56	$ 0.48
Weighted-average shares outstanding:
Basic (in shares)	115.3	114.4
Diluted (in shares)	117.4	117.1