CONSOLIDATED STATEMENT OF CHANGES IN EQUITY - USD ($) $ in Millions	Total	Common Stock, Par Value of $5	Common Stock, Capital in Excess of Par Value	Reinvested Earnings	Common Stock in Treasury	Accumulated Other Comprehensive (Loss) Income
Balances at the beginning of the period at Jun. 30, 2019	$ 1,520.1	$ 279.0	$ 320.4	$ 1,605.3	$ (332.8)	$ (351.8)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	119.9			119.9
Pension and postretirement benefits gain, net of tax	9.1					9.1
Net (loss) gain on derivative instruments, net of tax	(1.3)					(1.3)
Foreign currency translation	(11.3)					(11.3)
Cash Dividends:
Common	(29.1)			(29.1)
Share-based compensation plans	6.8	0.5	1.6		4.7
Stock options exercised	4.3	0.6	3.7
Balances at the end of the period at Mar. 31, 2020	1,618.5	280.1	325.7	1,696.1	(328.1)	(355.3)
Balances at the beginning of the period at Dec. 31, 2019	1,603.4	280.1	322.1	1,665.9	(328.4)	(336.3)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	39.9			39.9
Pension and postretirement benefits gain, net of tax	3.1					3.1
Net (loss) gain on derivative instruments, net of tax	(8.9)					(8.9)
Foreign currency translation	(13.2)					(13.2)
Cash Dividends:
Common	(9.7)			(9.7)
Share-based compensation plans	3.9		3.6		0.3
Balances at the end of the period at Mar. 31, 2020	1,618.5	280.1	325.7	1,696.1	(328.1)	(355.3)
Balances at the beginning of the period at Jun. 30, 2020	1,445.7	280.1	321.4	1,568.0	(325.8)	(398.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(172.5)			(172.5)
Pension and postretirement benefits gain, net of tax	105.3					105.3
Net (loss) gain on derivative instruments, net of tax	14.9					14.9
Foreign currency translation	10.8					10.8
Cash Dividends:
Common	(29.3)			(29.3)
Share-based compensation plans	6.1		(2.2)		8.3
Stock options exercised	0.2		0.2
Balances at the end of the period at Mar. 31, 2021	1,381.2	280.1	319.4	1,366.2	(317.5)	(267.0)
Balances at the beginning of the period at Dec. 31, 2020	1,332.9	280.1	317.0	1,416.5	(317.6)	(363.1)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net (loss) income	(40.5)			(40.5)
Pension and postretirement benefits gain, net of tax	98.1					98.1
Net (loss) gain on derivative instruments, net of tax	1.7					1.7
Foreign currency translation	(3.7)					(3.7)
Cash Dividends:
Common	(9.8)			(9.8)
Share-based compensation plans	2.3		2.2		0.1
Balances at the end of the period at Mar. 31, 2021	$ 1,381.2	$ 280.1	$ 319.4	$ 1,366.2	$ (317.5)	$ (267.0)