CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Operating Activities:
Consolidated net income	$ 115.8	$ 136.4	$ 173.2
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	93.9	98.4	94.3
Loss on disposal of property, plant and equipment	0.2	1.9	2.8
Deferred income taxes	(2.7)	(1.4)	15.4
Pension amortization and settlement loss	13.1	9.2	13.4
Provision for bad debts	2.6	6.3	3.2
Stock-based compensation	10.2	8.1	6.2
Asset write-downs	7.1	7.5	0.7
Reduction of right of use asset	12.3	12.7	0.0
Other non-cash items	(2.2)	(1.9)	(3.5)
Changes in operating assets and liabilities
Accounts receivable	13.7	9.9	(3.0)
Inventories	8.3	(16.0)	(14.7)
Pension plan funding	(12.2)	(7.7)	(24.2)
Accounts payable	(16.7)	(5.1)	(11.2)
Restructuring liabilities	(1.2)	2.4	(4.9)
Income taxes payable	3.9	2.5	(7.4)
Prepaid expenses and other	(5.5)	(24.9)	(36.7)
Net cash provided by operating activities	240.6	238.3	203.6
Investing Activities:
Purchases of property, plant and equipment	(66.8)	(65.0)	(75.9)
Acquisition of business, net of cash acquired	0.0	0.0	(122.5)
Acquisition of assets	(9.2)	0.0	0.0
Proceeds from sales of assets	0.7	0.0	0.9
Purchases of short-term investments	(8.7)	(5.5)	(7.7)
Proceeds from sale of short-term investments	5.3	7.7	6.1
Other investing activities	0.0	0.8	(0.9)
Net cash used in investing activities	(78.7)	(62.0)	(200.0)
Financing Activities:
Long-term debt issuance	400.0	0.0	0.0
Debt issuance costs	(6.4)	0.0	(1.5)
Repayment of long-term debt	(290.1)	(88.2)	(66.3)
Proceeds from issuance of short-term debt	0.0	0.0	113.0
Repayment of short-term debt	(101.2)	(4.0)	(14.0)
Purchase of common stock for treasury	(40.7)	(41.0)	(21.7)
Proceeds from issuance of stock under option plan	3.2	2.2	3.0
Excess tax benefits related to stock incentive programs	(2.0)	(1.7)	(3.1)
Dividends paid to non-controlling interests	(0.7)	(4.2)	(1.8)
Capital contribution from non-controlling interests	1.7	0.6	3.7
Cash dividends paid	(6.8)	(7.0)	(7.1)
Net cash provided by (used in) financing activities	(43.0)	(143.3)	4.2
Effect of exchange rate changes on cash and cash equivalents	7.2	(0.2)	(11.2)
Net increase (decrease) in cash and cash equivalents	126.1	32.8	(3.4)
Cash and cash equivalents at beginning of period	241.6	208.8	212.2
Cash and cash equivalents at end of period	367.7	241.6	208.8
Non-cash financing activities
Treasury stock purchases settled after period end	$ 1.8	$ 1.1	$ 0.3