Condensed Consolidated Statements of Earnings - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2017	Sep. 30, 2016
Income Statement [Abstract]
Revenues	$ 924.8	$ 895.3
Operating expenses:
Cost of revenues	726.6	717.9
Selling, general and administrative expenses	113.8	111.3
Total operating expenses	840.3	829.3
Operating income	84.4	66.0
Interest expense, net	9.4	10.4
Other non-operating (income) expenses, net	0.7	4.2
Earnings before income taxes	74.3	51.5
Provision for income taxes	24.4	17.9
Net earnings	$ 49.9	$ 33.7
Basic earnings per share (in dollars per share)	$ 0.43	$ 0.28
Diluted earnings per share (in dollars per share)	$ 0.42	$ 0.28
Weighted-average shares outstanding:
Basic (in shares)	116.5	118.5
Diluted (in shares)	119.8	121.6
Dividends declared per common share (in dollars per share)	$ 0.365	$ 0.33