Condensed Consolidated Statements of Earnings (USD $) In Millions, except Per Share data, unless otherwise specified	3 Months Ended		9 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Mar. 31, 2013	Mar. 31, 2012
Income Statement [Abstract]
Revenues	$ 576.7	$ 547.0	$ 1,565.7	$ 1,503.2
Cost of revenues	426.2	420.8	1,203.8	1,186.2
Selling, general and administrative expenses	79.0	70.6	229.1	208.8
Impairment charge		22.5		32.2
Other expenses, net	3.8	4.3	11.8	10.4
Total expenses	509.0	518.2	1,444.7	1,437.6
Earnings from continuing operations before income taxes	67.7	28.8	121.0	65.6
Provision for income taxes	24.3	10.7	43.5	24.0
Net earnings from continuing operations	43.4	18.1	77.5	41.6
Loss from discontinued operations, net of tax benefit		(1.4)		(1.4)
Net earnings	$ 43.4	$ 16.7	$ 77.5	$ 40.2
Basic earnings per share:
Basic earnings per share from continuing operations	$ 0.36	$ 0.15	$ 0.63	$ 0.34
Basic loss per share from discontinued operations		$ (0.01)		$ (0.01)
Basic earnings per share	$ 0.36	$ 0.14	$ 0.63	$ 0.33
Diluted earnings per share:
Diluted earnings per share from continuing operations	$ 0.35	$ 0.14	$ 0.62	$ 0.33
Diluted loss per share from discontinued operations		$ (0.01)		$ (0.01)
Diluted earnings per share	$ 0.35	$ 0.13	$ 0.62	$ 0.32
Weighted-average shares outstanding:
Basic	121.2	124.0	122.4	123.8
Diluted	125.0	128.4	125.9	127.4
Dividends declared per common share	$ 0.18	$ 0.16	$ 0.54	$ 0.48