Condensed Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	3 Months Ended
	Sep. 30, 2020	Sep. 30, 2019
Statement of Comprehensive Income [Abstract]
Net earnings	$ 42.3	$ 6.1
Other comprehensive income (loss), net of income taxes
Pension and other postretirement benefit plans activity	(1.0)	0.5
Unrealized foreign currency translation gain (loss), net	8.1	(4.9)
Other comprehensive income (loss), net of income taxes	7.1	(4.4)
Comprehensive income	$ 49.4	$ 1.7