CONSOLIDATED STATEMENTS OF CASH FLOWS - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Operating Activities:
Consolidated net income	$ 199.0	$ 137.1	$ 111.6
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation, depletion and amortization	91.0	91.9	98.3
Loss on disposal of property, plant and equipment	1.8	1.9	0.1
Deferred income taxes	(76.1)	(10.9)	(2.5)
Pension amortization and settlement loss	7.4	7.9	9.9
Provision for bad debts	3.8	6.2	2.6
Stock-based compensation	8.1	6.3	11.2
Asset impairment charge	5.3	18.5	34.2
Non-cash debt modification costs	1.8	0.0	0.0
Other non-cash items	(1.7)	(3.1)	(0.2)
Changes in operating assets and liabilities
Accounts receivable	(27.3)	(4.9)	36.6
Inventories	(25.2)	3.1	3.1
Pension plan funding	(10.8)	(10.5)	(10.4)
Accounts payable	28.0	(4.8)	(9.7)
Restructuring liabilities	4.5	(4.3)	(3.0)
Income taxes payable	(12.6)	5.4	(15.4)
Prepaid expenses and other	10.6	(14.7)	3.6
Net cash provided by operating activities	207.6	225.1	270.0
Investing Activities:
Purchases of property, plant and equipment	(76.7)	(62.4)	(86.0)
Proceeds from sale of assets	1.4	1.4	5.0
Purchases of short-term investments	3.8	(6.7)	(4.7)
Proceeds from sale of short-term investments	(4.5)	8.0	1.1
Other	(1.5)	(1.9)	0.0
Net cash used in investing activities	(77.5)	(61.6)	(84.6)
Financing Activities:
Proceeds from issuance of long-term debt	0.0	7.2	11.8
Repayment of long-term debt	(118.9)	(193.2)	(191.8)
Net issuance (repayment) of short-term debt	(0.2)	(0.1)	1.3
Purchase of common shares for treasury	(0.7)	(2.6)	0.0
Proceeds from issuance of stock under option plan	14.6	5.5	2.5
Excess tax benefits related to stock incentive programs	(3.6)	0.3	0.5
Dividends paid to non-controlling interest	(2.4)	(4.9)	(1.1)
Cash dividends paid	(7.0)	(7.0)	(7.0)
Net cash used in financing activities	(118.2)	(194.8)	(183.8)
Effect of exchange rate changes on cash and cash equivalents	11.8	(9.6)	(21.8)
Net increase (decrease) in cash and cash equivalents	23.7	(40.9)	(20.2)
Cash and cash equivalents at beginning of period	188.5	229.4	249.6
Cash and cash equivalents at end of period	$ 212.2	$ 188.5	$ 229.4