Condensed Consolidated Statements of Shareholders' Equity - USD ($) $ in Millions	Total	Cumulative Effect, Period of Adoption, Adjustment	Common Stock	Class B Common Stock	Series A Preferred Stock	Common Stock Common Stock	Common Stock Class B Common Stock	Additional Paid-in Capital	Retained Earnings	Retained Earnings Cumulative Effect, Period of Adoption, Adjustment	Retained Earnings Common Stock	Retained Earnings Class B Common Stock	Retained Earnings Series A Preferred Stock	Accumulated Other Comprehensive Income (Loss)
Beginning balance at Jun. 30, 2019	$ 974.6	$ (7.8)				$ 40.1	$ 5.1	$ 216.7	$ 759.0	$ (7.8)				$ (46.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	6.1								6.1
Other comprehensive income (loss), net of income taxes	(4.4)													(4.4)
Shares issued under incentive plans, net of forfeitures	0.5					0.1		0.4
Purchases of Company stock	(1.8)					(0.1)		(1.7)
Share-based compensation	7.5							7.5
Dividends paid			$ (24.3)	$ (2.9)	$ (14.4)						$ (24.3)	$ (2.9)	$ (14.4)
Accretion of Series A preferred stock					$ (4.5)								$ (4.5)
Ending balance at Sep. 30, 2019	928.6					40.1	5.1	222.9	711.2					(50.7)
Beginning balance at Jun. 30, 2020	388.2	$ 2.1				40.3	5.1	227.6	197.6	$ 2.1				(82.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net earnings	42.3								42.3
Other comprehensive income (loss), net of income taxes	7.1													7.1
Shares issued under incentive plans, net of forfeitures	0.4					0.1		0.3
Purchases of Company stock	(0.4)							(0.4)
Share-based compensation	8.8							8.8
Ending balance at Sep. 30, 2020	$ 448.5					$ 40.4	$ 5.1	$ 236.3	$ 242.0					$ (75.3)