CONSOLIDATED STATEMENTS OF INCOME (Unaudited) - USD ($) shares in Millions, $ in Millions	3 Months Ended
	Sep. 30, 2019	Sep. 30, 2018
Income Statement [Abstract]
Net sales	$ 585.4	$ 572.4
Cost of sales	472.8	480.7
Gross profit	112.6	91.7
Selling, general and administrative expenses	52.8	46.7
Operating income	59.8	45.0
Interest expense	(5.4)	(6.3)
Other (expense) income, net	(0.3)	1.6
Income before income taxes	54.1	40.3
Income tax expense	12.9	8.8
Net income	$ 41.2	$ 31.5
EARNINGS PER COMMON SHARE:
Basic (in dollars per share)	$ 0.85	$ 0.66
Diluted (in dollars per share)	$ 0.85	$ 0.65
WEIGHTED AVERAGE COMMON SHARES OUTSTANDING:
Basic (in shares)	47.9	47.6
Diluted (in shares)	48.3	48.2