CONSOLIDATED STATEMENTS 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, 2023	$ 1,396.1	$ 280.7	$ 328.4	$ 1,228.0	$ (298.0)	$ (143.0)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	92.9			92.9
Net gain (loss) on derivative instruments, net of tax	(1.4)					(1.4)
Pension and postretirement benefits, net of tax	28.6					28.6
Foreign currency translation	0.5					0.5
Cash dividends:
Common stock	(29.9)			(29.9)
Share-based compensation plans	4.0		(4.5)		8.5
Stock options exercised	11.8	2.5	9.3
Balances at the end of the period at Mar. 31, 2024	1,502.6	283.2	333.2	1,291.0	(289.5)	(115.3)
Balances at the beginning of the period at Dec. 31, 2023	1,473.8	283.2	327.9	1,294.8	(289.7)	(142.4)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	6.3			6.3
Net gain (loss) on derivative instruments, net of tax	2.3					2.3
Pension and postretirement benefits, net of tax	27.0					27.0
Foreign currency translation	(2.2)					(2.2)
Cash dividends:
Common stock	(10.1)			(10.1)
Share-based compensation plans	5.1		4.9		0.2
Stock options exercised	0.4		0.4
Balances at the end of the period at Mar. 31, 2024	1,502.6	283.2	333.2	1,291.0	(289.5)	(115.3)
Balances at the beginning of the period at Jun. 30, 2024	1,628.8	284.9	352.6	1,374.5	(289.3)	(93.9)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	264.3			264.3
Net gain (loss) on derivative instruments, net of tax	3.1					3.1
Pension and postretirement benefits, net of tax	2.9					2.9
Foreign currency translation	(1.6)					(1.6)
Cash dividends:
Common stock	(30.2)			(30.2)
Purchase of treasury stock	(77.8)				(77.8)
Share-based compensation plans	(4.2)		(0.2)		(4.0)
Stock options exercised	(3.6)	1.1	(4.7)
Balances at the end of the period at Mar. 31, 2025	1,781.7	286.0	347.7	1,608.6	(371.1)	(89.5)
Balances at the beginning of the period at Dec. 31, 2024	1,716.9	285.6	338.0	1,523.2	(333.7)	(96.2)
Increase (Decrease) in Stockholders' Equity [Roll Forward]
Net income	95.4			95.4
Net gain (loss) on derivative instruments, net of tax	2.3					2.3
Pension and postretirement benefits, net of tax	1.0					1.0
Foreign currency translation	3.4					3.4
Cash dividends:
Common stock	(10.0)			(10.0)
Purchase of treasury stock	(37.5)				(37.5)
Share-based compensation plans	6.5		6.4		0.1
Stock options exercised	3.7	0.4	3.3
Balances at the end of the period at Mar. 31, 2025	$ 1,781.7	$ 286.0	$ 347.7	$ 1,608.6	$ (371.1)	$ (89.5)