CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2019
Statement of Cash Flows [Abstract]
Net (loss) income	$ (229.6)	$ 1.5	$ 167.0
Adjustments to reconcile net (loss) income to net cash provided from operating activities:
Depreciation and amortization	123.6	123.9	121.5
LIFO decrement	52.2	1.8	0.0
Goodwill impairment charge	52.8	34.6	0.0
Non-cash inventory write-downs from restructuring	4.2	29.3	0.0
Non-cash restructuring and asset impairment charges	16.2	56.4	0.0
Debt extinguishment losses, net	8.2	(0.0)	0.0
Deferred income taxes	(33.6)	(0.4)	16.5
Net pension expense	24.6	15.3	11.6
Share-based compensation expense	10.4	10.9	17.6
Net loss on disposal of property, plant, and equipment and assets held for sale	0.3	0.2	1.2
Gain on insurance recovery	0.0	0.0	(11.4)
Changes in working capital and other:
Accounts receivable	(14.9)	90.3	(5.3)
Inventories	238.5	29.5	(94.0)
Other current assets	(33.9)	(20.5)	6.8
Accounts payable	22.4	(109.9)	20.1
Accrued liabilities	33.8	(18.1)	(4.9)
Pension plan contributions	(19.9)	(6.5)	(5.5)
Other postretirement plan contributions	(2.7)	(3.5)	(3.1)
Other, net	(2.6)	(3.0)	(5.7)
Net cash provided from operating activities	250.0	231.8	232.4
INVESTING ACTIVITIES
Purchases of property, plant, equipment and software	(100.5)	(171.4)	(180.3)
Acquisition of business, net of cash acquired	0.0	0.0	(79.0)
Proceeds from disposals of property, plant and equipment and assets held for sale	1.6	0.2	0.4
Proceeds from insurance recovery	0.0	0.0	11.4
Proceeds from divestiture of business	20.0	0.0	0.0
Proceeds from sales and maturities of marketable securities	0.0	0.0	2.9
Net cash used for investing activities	(78.9)	(171.2)	(244.6)
FINANCING ACTIVITIES
Credit agreement borrowings	0.0	351.1	163.9
Credit agreement repayments	0.0	(181.1)	(163.9)
Net change in short-term credit agreement borrowings	(170.0)	(19.7)	19.7
Proceeds from issuance of long-term debt, net of offering costs	395.5	0.0	0.0
Payments on long-term debt	(250.0)	0.0	0.0
Payments for debt extinguishment costs, net	(8.2)	0.0	0.0
Payments for debt issue costs	(2.5)	0.0	0.0
Dividends paid	(39.1)	(38.8)	(38.6)
Proceeds from stock options exercised	0.5	4.3	3.9
Withholding tax payments on share-based compensation awards	(2.3)	(8.0)	(4.4)
Net cash (used for) provided from financing activities	(76.1)	107.8	(19.4)
Effect of exchange rate changes on cash and cash equivalents	(0.7)	(2.3)	2.4
INCREASE (DECREASE) IN CASH AND CASH EQUIVALENTS	94.3	166.1	(29.2)
Cash and cash equivalents at beginning of year	193.1	27.0	56.2
Cash and cash equivalents at end of year	$ 287.4	$ 193.1	$ 27.0