CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Mar. 31, 2020	Mar. 31, 2019
Statement of Comprehensive Income [Abstract]
Net income	$ 39.9	$ 51.1	$ 119.9	$ 118.1
Other comprehensive (loss) income, net of tax
Cumulative adjustment upon adoption of ASU 2017-12 reclassified to reinvested earnings	0.0	0.0	0.0	(1.0)
Pension and postretirement benefits, net of tax of $(0.9), $(0.5), $(3.1) and $(1.5), respectively	3.1	1.7	9.1	5.1
Net (loss) gain on derivative instruments, net of tax of $2.8, $(1.0), $0.4 and $12.5, respectively	(8.9)	3.2	(1.3)	(35.2)
Marketable securities gain, net of tax of $0.0, $0.0, $0.0 and $0.0, respectively	0.0	0.0	0.0	0.3
Foreign currency translation (loss) gain	(13.2)	1.1	(11.3)	(0.9)
Other comprehensive (loss) income, net of tax	(19.0)	6.0	(3.5)	(31.7)
Comprehensive income	$ 20.9	$ 57.1	$ 116.4	$ 86.4