Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net earnings	$ 37.8	$ 18.6	$ 43.9	$ 35.6
Other comprehensive income (loss), net of income taxes
Pension and other postretirement benefit plans activity	0.4	0.4	0.9	0.8
Unrealized foreign currency translation gain (loss), net	9.2	(3.0)	4.3	(5.3)
Other comprehensive income (loss), net of income taxes	9.6	(2.6)	5.2	(4.5)
Comprehensive income	$ 47.4	$ 16.0	$ 49.1	$ 31.1