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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
 12 Months Ended
Jun. 30, 2026
Jun. 30, 2025
Jun. 30, 2024
OPERATING ACTIVITIES      
Net income $ 529,800,000 $ 376,000,000.0 $ 186,500,000
Adjustments to reconcile net income to net cash provided from operating activities:      
Depreciation and amortization 147,100,000 139,200,000 134,600,000
Goodwill impairment charge 0 0 14,100,000
Noncash restructuring and asset impairment charges 0 2,500,000 15,800,000
Debt extinguishment losses 15,600,000 0 0
Deferred income taxes 21,200,000 (17,400,000) (13,300,000)
Net pension expense 14,600,000 24,800,000 76,000,000.0
Share-based compensation expense 26,400,000 22,800,000 19,800,000
Net loss on disposal of property, plant, and equipment and assets held for sale 1,400,000 2,000,000.0 4,600,000
Changes in working capital and other:      
Accounts receivable (128,300,000) (1,800,000) (32,600,000)
Inventories (28,400,000) (60,400,000) (96,700,000)
Other current assets 20,000,000.0 13,700,000 (31,300,000)
Accounts payable 17,200,000 (1,400,000) (11,000,000.0)
Accrued liabilities 3,100,000 13,700,000 23,600,000
Pension plan contributions (23,800,000) (64,800,000) (11,300,000)
Other postretirement plan contributions (4,000,000.0) (3,600,000) (2,600,000)
Other, net (6,900,000) (4,900,000) (1,300,000)
Net cash provided from operating activities 605,000,000.0 440,400,000 274,900,000
INVESTING ACTIVITIES      
Purchases of property, plant, equipment and software (242,700,000) (154,300,000) (96,600,000)
Proceeds from disposals of property, plant and equipment and assets held for sale 0 1,400,000 700,000
Net cash used for investing activities (242,700,000) (152,900,000) (95,900,000)
FINANCING ACTIVITIES      
Credit agreement borrowings 0 0 62,500,000
Credit agreement repayments 0 0 (62,500,000)
Proceeds from issuance of long-term debt, net of offering costs 692,100,000 0 0
Payments on long-term debt (700,000,000.0) 0 0
Payments for debt extinguishment costs (11,400,000) 0 0
Payments for debt issue costs (4,100,000) 0 0
Dividends paid (40,300,000) (40,300,000) (40,000,000.0)
Purchases of treasury stock (179,100,000) (101,900,000) 0
Proceeds from stock options exercised 14,300,000 13,400,000 40,900,000
Withholding tax payments on share-based compensation awards (58,300,000) (38,300,000) (24,200,000)
Net cash used for financing activities (286,800,000) (167,100,000) (23,300,000)
Effect of exchange rate changes on cash and cash equivalents 2,300,000 (4,000,000.0) (1,100,000)
INCREASE IN CASH AND CASH EQUIVALENTS 77,800,000 116,400,000 154,600,000
Cash and cash equivalents at beginning of year 315,500,000 199,100,000 44,500,000
Cash and cash equivalents at end of year $ 393,300,000 $ 315,500,000 $ 199,100,000