Quarterly Operating Results (Schedule Of Unaudited Quarterly Results Of Operations) (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended								12 Months Ended
	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2015
Selected Quarterly Financial Information [Abstract]
Sales Revenue, Services, Net	$ 557.2	$ 529.3	$ 534.4	$ 496.7	$ 536.6	$ 527.1	$ 518.5	$ 512.1	$ 2,117.6	$ 2,094.3	$ 2,016.0
Gross profit	207.9	179.7	183.5	169.0	189.8	189.3	186.0	168.9	740.1	734.0	671.8
Income from operations	48.0	29.9	60.0	53.3	64.2	69.7	54.6	35.5	191.2	224.0	199.9
Net income	$ 29.9	$ 17.8	$ 21.8	$ 37.8	$ 42.7	$ 47.9	$ 39.4	$ 24.9	$ 107.3	$ 154.9	$ 147.8
Diluted earnings per share	$ 0.58	$ 0.35	$ 0.41	$ 0.70	$ 0.80	$ 0.89	$ 0.73	$ 0.45	$ 2.06	$ 2.86	$ 2.65