CONSOLIDATED STATEMENTS OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Reinvested Earnings	Common Stock in Treasury	Accumulated Other Comprehensive (Loss) Income
Balances, beginning of period at Jun. 30, 2020	$ 1,445.7	$ 280.1	$ 321.4	$ 1,568.0	$ (325.8)	$ (398.0)
Increase (Decrease) in Stockholders' Equity
Net income (loss)	(229.6)			(229.6)
Pension and postretirement benefits gain (loss), net of tax	175.2					175.2
Net gain (loss) on derivative instruments, net of tax	18.0					18.0
Foreign currency translation	12.5					12.5
Cash dividends:
Common	(39.1)			(39.1)
Share-based compensation plans	9.2		0.8		8.4
Stock options exercised	0.4		0.4
Balances, end of period at Jun. 30, 2021	$ 1,392.3	$ 280.1	322.6	1,299.3	$ (317.4)	(192.3)
Balances, beginning of period (in shares) at Jun. 30, 2020	47,850,468	56,012,748
Balances, beginning of period (in shares) at Jun. 30, 2020					8,162,280
Common Shares
Stock options exercised (in shares)	11,871	11,871
Share-based compensation plans (in shares)	178,337				178,337
Balances, end of period (in shares) at Jun. 30, 2021	48,040,676	56,024,619
Balances, end of period (in shares) at Jun. 30, 2021					7,983,943
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ (49.1)			(49.1)
Pension and postretirement benefits gain (loss), net of tax	26.2					26.2
Net gain (loss) on derivative instruments, net of tax	(1.4)					(1.4)
Foreign currency translation	(6.0)					(6.0)
Cash dividends:
Common	(39.2)			(39.2)
Share-based compensation plans	7.7		(2.3)		$ 10.0
Balances, end of period at Jun. 30, 2022	$ 1,330.5	$ 280.1	320.3	1,211.0	$ (307.4)	(173.5)
Common Shares
Stock options exercised (in shares)	891	891
Share-based compensation plans (in shares)	244,872				244,872
Balances, end of period (in shares) at Jun. 30, 2022	48,286,439	56,025,510
Balances, end of period (in shares) at Jun. 30, 2022	7,739,071				7,739,071
Increase (Decrease) in Stockholders' Equity
Net income (loss)	$ 56.4			56.4
Pension and postretirement benefits gain (loss), net of tax	37.4					37.4
Net gain (loss) on derivative instruments, net of tax	(12.5)					(12.5)
Foreign currency translation	5.6					5.6
Cash dividends:
Common	(39.4)			(39.4)
Share-based compensation plans	13.1		3.7		$ 9.4
Stock options exercised	5.0	$ 0.6	4.4
Balances, end of period at Jun. 30, 2023	$ 1,396.1	$ 280.7	$ 328.4	$ 1,228.0	$ (298.0)	$ (143.0)
Common Shares
Stock options exercised (in shares)	117,621	117,621
Share-based compensation plans (in shares)	231,680				231,680
Balances, end of period (in shares) at Jun. 30, 2023	48,635,740	56,143,131
Balances, end of period (in shares) at Jun. 30, 2023	7,507,391				7,507,391