CONSOLIDATED STATEMENT OF CHANGES IN EQUITY (Unaudited) - USD ($) $ in Millions	Total	Common Stock	Capital in Excess of Par Value	Reinvested Earnings	Common Stock in Treasury	Accumulated Other Comprehensive (Loss) Income
Balances, period start at Jun. 30, 2016	$ 1,104.9	$ 276.3	$ 273.5	$ 1,308.9	$ (343.9)	$ (409.9)
Increase (Decrease) in Stockholders' Equity
Net income	21.5			21.5
Pension and postretirement benefits gain, net of tax	28.8					28.8
Net gain on derivative instruments, net of tax	21.8					21.8
Foreign currency translation	(2.1)					(2.1)
Cash Dividends:
Common @ $0.54 per share	(25.6)			(25.6)
Share-based compensation plans	9.7		7.9		1.8
Stock options exercised	2.2	0.4	1.8
Tax windfall on share-based compensation	0.4		0.4
Balances, period end at Mar. 31, 2017	1,161.6	276.7	283.6	1,304.8	(342.1)	(361.4)
Balances, period start at Dec. 31, 2016						(376.9)
Increase (Decrease) in Stockholders' Equity
Net income	20.7
Pension and postretirement benefits gain, net of tax	5.7
Net gain on derivative instruments, net of tax	7.2
Foreign currency translation	2.6
Balances, period end at Mar. 31, 2017	1,161.6	276.7	283.6	1,304.8	(342.1)	(361.4)
Balances, period start at Jun. 30, 2017	1,198.6	276.7	284.8	1,321.8	(341.6)	(343.1)
Increase (Decrease) in Stockholders' Equity
Net income	145.7			145.7
Pension and postretirement benefits gain, net of tax	6.7					6.7
Net gain on derivative instruments, net of tax	24.4					24.4
Foreign currency translation	4.0					4.0
Cash Dividends:
Common @ $0.54 per share	(25.8)			(25.8)
Share-based compensation plans	13.0		11.2		1.8
Stock options exercised	4.5	0.7	3.8
Balances, period end at Mar. 31, 2018	1,371.1	277.4	299.8	1,441.7	(339.8)	(308.0)
Balances, period start at Dec. 31, 2017						(315.1)
Increase (Decrease) in Stockholders' Equity
Net income	30.2
Pension and postretirement benefits gain, net of tax	2.1
Net gain on derivative instruments, net of tax	1.3
Foreign currency translation	3.7
Balances, period end at Mar. 31, 2018	$ 1,371.1	$ 277.4	$ 299.8	$ 1,441.7	$ (339.8)	$ (308.0)