Condensed Consolidated Statements of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		6 Months Ended
	Dec. 31, 2013	Dec. 31, 2012	Dec. 31, 2013	Dec. 31, 2012
Income Statement [Abstract]
Revenues	$ 520.6	$ 493.2	$ 1,065.8	$ 989.0
Cost of revenues	385.1	387.6	782.6	777.6
Selling, general and administrative expenses	86.0	77.2	159.5	150.1
Other expenses, net	6.8	3.7	11.7	8.0
Total expenses	477.9	468.5	953.8	935.7
Earnings before income taxes	42.7	24.7	112.0	53.3
Provision for income taxes	15.1	8.9	40.0	19.2
Net earnings	$ 27.6	$ 15.8	$ 72.0	$ 34.1
Basic earnings per share	$ 0.23	$ 0.13	$ 0.60	$ 0.28
Diluted earnings per share	$ 0.22	$ 0.13	$ 0.58	$ 0.27
Weighted-average shares outstanding:
Basic	119.2	122.0	119.1	123.0
Diluted	124.1	125.5	123.6	126.3
Dividends declared per common share	$ 0.21	$ 0.18	$ 0.42	$ 0.36