Condensed Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Mar. 31, 2021	Mar. 31, 2020	Mar. 31, 2021	Mar. 31, 2020
Statement of Comprehensive Income [Abstract]
Net earnings (loss)	$ 79.1	$ (284.4)	$ 269.9	$ (240.5)
Other comprehensive income (loss)
Pension and other postretirement benefit plans activity, net of income taxes	0.2	0.4	(2.4)	1.3
Foreign currency translation adjustment	1.7	(9.4)	20.5	(5.1)
Total other comprehensive income (loss)	1.9	(9.0)	18.1	(3.8)
Comprehensive income (loss)	$ 81.0	$ (293.4)	$ 288.0	$ (244.3)