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, 2015	$ 1,325.9	$ 276.2	$ 266.6	$ 1,332.4	$ (221.1)	$ (328.2)
Increase (Decrease) in Stockholders' Equity
Net income	11.3			11.3
Pension and postretirement benefits loss, net of tax	(87.5)					(87.5)
Net gain on derivative instruments, net of tax	6.7					6.7
Foreign currency translation	(0.9)					(0.9)
Cash Dividends:
Common @ $0.72 per share	(34.8)			(34.8)
Purchases of treasury stock	(123.9)				(123.9)
Share-based compensation plans	8.8		7.7		1.1
Stock options exercised	0.5	0.1	0.4
Tax shortfall on share-based compensation	(1.2)		(1.2)
Balances, end of period at Jun. 30, 2016	$ 1,104.9	$ 276.3	273.5	1,308.9	$ (343.9)	(409.9)
Balances, beginning of period (in shares) at Jun. 30, 2015	50,318,244	55,234,942			(4,916,698)
Common Shares
Purchase of treasury stock (in shares)	(3,762,200)				(3,762,200)
Stock options exercised (in shares)	19,627	19,627
Share-based compensation plans (in shares)	24,454				24,454
Balances, end of period (in shares) at Jun. 30, 2016	46,600,125	55,254,569			(8,654,444)
Increase (Decrease) in Stockholders' Equity
Net income	$ 47.0			47.0
Pension and postretirement benefits loss, net of tax	45.3					45.3
Net gain on derivative instruments, net of tax	19.5					19.5
Foreign currency translation	2.0					2.0
Cash Dividends:
Common @ $0.72 per share	(34.1)			(34.1)
Share-based compensation plans	12.7		10.4		$ 2.3
Stock options exercised	2.2	$ 0.4	1.8
Tax shortfall on share-based compensation	(0.9)		(0.9)
Balances, end of period at Jun. 30, 2017	$ 1,198.6	$ 276.7	284.8	1,321.8	$ (341.6)	(343.1)
Common Shares
Purchase of treasury stock (in shares)	0
Stock options exercised (in shares)	95,089	95,089
Share-based compensation plans (in shares)	57,966				57,966
Balances, end of period (in shares) at Jun. 30, 2017	46,753,180	55,349,658			(8,596,478)
Increase (Decrease) in Stockholders' Equity
Net income	$ 188.5			188.5
Pension and postretirement benefits loss, net of tax	78.6					78.6
Net gain on derivative instruments, net of tax	26.1					26.1
Foreign currency translation	(1.4)					(1.4)
Cash Dividends:
Common @ $0.72 per share	(34.4)			(34.4)
Share-based compensation plans	17.0		14.2		$ 2.8
Stock options exercised	12.9	$ 1.9	11.0
Balances, end of period at Jun. 30, 2018	$ 1,485.9	$ 278.6	$ 310.0	$ 1,475.9	$ (338.8)	$ (239.8)
Common Shares
Purchase of treasury stock (in shares)	0
Stock options exercised (in shares)	362,571	362,571
Share-based compensation plans (in shares)	75,993				75,993
Balances, end of period (in shares) at Jun. 30, 2018	47,191,744	55,712,229			(8,520,485)