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CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2021
Dec. 31, 2020
Dec. 31, 2019
Operating Activities:      
Consolidated net income $ 168.5 $ 115.8 $ 136.4
Adjustments to reconcile net income to net cash provided by operating activities:      
Depreciation, depletion and amortization 94.6 93.9 98.4
Loss on disposal of property, plant and equipment 0.4 0.2 1.9
Deferred income taxes 2.1 (2.7) (1.4)
Pension amortization and settlement loss 13.1 13.1 9.2
Provision for bad debts 0.9 2.6 6.3
Stock-based compensation 10.7 10.2 8.1
Asset write-downs 0.7 7.1 7.5
Reduction of right of use asset 12.3 12.3 12.7
Other non-cash items (2.8) (2.2) (1.9)
Changes in operating assets and liabilities      
Accounts receivable (7.2) 13.7 9.9
Inventories (58.2) 8.3 (16.0)
Pension plan funding (11.1) (12.2) (7.7)
Accounts payable 43.0 (16.7) (5.1)
Restructuring liabilities (1.4) (1.2) 2.4
Income taxes payable (6.0) 3.9 2.5
Prepaid expenses and other (27.2) (5.5) (24.9)
Net cash provided by operating activities 232.4 240.6 238.3
Investing Activities:      
Purchases of property, plant and equipment (86.0) (66.8) (65.0)
Cash paid for acquisitions, net of cash acquired (194.4) (9.2) 0.0
Proceeds from sale of assets 0.7 0.7 0.0
Purchases of short-term investments (9.4) (8.7) (5.5)
Proceeds from sale of short-term investments 8.3 5.3 7.7
Other investing activities 2.2 0.0 0.8
Net cash used in investing activities (278.6) (78.7) (62.0)
Financing Activities:      
Long-term debt issuance 0.0 400.0 0.0
Debt issuance costs 0.0 (6.4) 0.0
Repayment of long-term debt (1.2) (290.1) (88.2)
Proceeds from issuance of short-term debt 100.5 0.0 0.0
Repayment of short-term debt (20.5) (101.2) (4.0)
Purchase of common stock for treasury (74.7) (40.7) (41.0)
Proceeds from issuance of stock under option plan 12.8 3.2 2.2
Tax withholding payments for stock-based compensation (2.7) (2.0) (1.7)
Dividends paid to non-controlling interests (1.8) (0.7) (4.2)
Capital contribution from non-controlling interests 0.0 1.7 0.6
Cash dividends paid (6.8) (6.8) (7.0)
Net cash provided by (used in) financing activities 5.6 (43.0) (143.3)
Effect of exchange rate changes on cash and cash equivalents (27.6) 7.2 (0.2)
Net increase (decrease) in cash and cash equivalents (68.2) 126.1 32.8
Cash and cash equivalents at beginning of period 367.7 241.6 208.8
Cash and cash equivalents at end of period 299.5 367.7 241.6
Non-cash financing activities      
Treasury stock purchases settled after period end $ 0.5 $ 1.8 $ 1.1