Quarterly Financial Results (Unaudited) - Summary of Quarterly Results of Operations (Detail) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2014	Sep. 30, 2014	Jun. 30, 2016	Jun. 30, 2015	Jun. 30, 2014
Organization, Consolidation and Presentation of Financial Statements [Abstract]
Revenues	$ 974.5	$ 688.8	$ 638.9	$ 594.7	$ 929.6	$ 634.2	$ 574.6	$ 555.8	$ 2,897.0	$ 2,694.2	$ 2,558.0
Gross profit	388.2	202.3	174.4	156.1	374.5	181.6	160.6	149.3
Earnings (loss) before income taxes	270.3	100.6	70.2	59.1	261.8	89.0	59.1	57.1	468.9	438.9	395.5
Earnings before income taxes	262.5	93.4	61.3	51.7	255.4	81.9	51.6	50.0	389.2	365.4	308.1
Net earnings	$ 170.1	$ 63.7	$ 40.2	$ 33.5	$ 165.9	$ 54.0	$ 34.7	$ 32.5	$ 307.5	$ 287.1	$ 263.0
Basic EPS (in usd per share)	$ 1.44	$ 0.54	$ 0.34	$ 0.28	$ 1.39	$ 0.45	$ 0.29	$ 0.27	$ 2.60	$ 2.39	$ 2.20
Diluted EPS (in usd per share)	$ 1.40	$ 0.52	$ 0.33	$ 0.28	$ 1.35	$ 0.43	$ 0.28	$ 0.26	$ 2.53	$ 2.32	$ 2.12