Condensed Consolidated Statements of Comprehensive Income - 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 earnings	$ 166.8	$ 172.2	$ 232.8	$ 298.8
Other comprehensive income (loss), net:
Foreign currency translation adjustments	0.1	4.9	2.9	(11.2)
Pension and post-retirement liability adjustment, net of taxes of $(0.1) and $(0.1) for the three months ended March 31, 2020 and 2019, respectively; and $(0.3) and $(0.2) for the nine months ended March 31, 2020 and 2019, respectively	0.4	0.2	1.1	0.6
Total other comprehensive income (loss), net	0.5	5.1	4.0	(10.7)
Comprehensive income	$ 167.3	$ 177.2	$ 236.8	$ 288.1