Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	12 Months Ended
	Dec. 31, 2012	Dec. 31, 2011	Dec. 31, 2010
Cash flow from operating activities:
Net income (loss)	$ 64.9	$ 58.5	$ 28.5
Adjustments to reconcile net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion, and amortization	45.3	42.1	36.3
Undistributed losses (earnings) from affiliates and joint ventures	(2.0)	(3.6)	11.5
Increase (decrease) in allowance for doubtful accounts	5.5	5.1	0.3
Decrease (increase) in deferred income taxes	(0.8)	6.8	5.2
Tax benefit from employee stock plans	(0.1)	0.6	0.3
(Gain) loss on sale of depreciable assets	(1.0)	(0.8)	0.2
Impairment charge	0.9	0.1	1.0
Stock compensation expense	4.4	4.9	4.5
Excess tax benefits on stock option exercises	(0.4)	(0.7)	(0.4)
Other	2.3	0.5	(0.3)
(Increase) decrease in current assets, net of effects of acquisitions:
Accounts receivable	(0.3)	(37.2)	(45.7)
Income taxes receivable	1.2	0.3	(6.7)
Inventories	(7.6)	(46.1)	(11.3)
Prepaid expenses	(1.6)	(3.6)	3.2
Other assets	0	(0.1)	0
Increase (decrease) in current liabilities, net of effects of acquisitions:
Accounts payable	(6.7)	10.0	12.6
Accrued liabilities and income taxes	(1.1)	4.4	9.2
(Increase) decrease in other noncurrent assets	(0.4)	(0.6)	(4.4)
Increase (decrease) in other noncurrent liabilities	6.2	(1.3)	4.3
Net cash provided by operating activities	108.7	39.3	48.3
Cash flow from investing activities:
Proceeds from sale of land and depreciable assets	2.4	1.9	0.8
Capital expenditures	(74.5)	(61.0)	(47.3)
(Increase) decrease in investments and advances (to) from affiliates and joint ventures	0.2	(2.9)	(2.7)
Proceeds from sale of interests in affiliates and joint ventures	2.4	6.2	0
Acquisition of businesses, net of cash acquired	0	0	(0.4)
Other	1.4	1.6	0.9
Net cash used in investing activities	(68.1)	(54.2)	(48.7)
Cash flow from financing activities:
Proceeds from issuance of debt	1,575.8	1,345.0	1,229.0
Principal payments of debt	(1,588.1)	(1,319.7)	(1,201.3)
Purchase of noncontrolling interest	0	0	(11.9)
Proceeds from exercise of stock awards	9.7	8.1	5.4
Excess tax benefits on stock option exercises	0.4	0.7	0.4
Contribution from noncontrolling partner	0.1	0	0
Dividends paid	(23.5)	(22.8)	(22.4)
Net cash provided by (used in) financing activities	(25.6)	11.3	(0.8)
Effect of foreign currency rate changes on cash	0.9	0.9	0.3
Net increase (decrease) in cash and cash equivalents	15.9	(2.7)	(0.9)
Cash and cash equivalents at the beginning of the year	24.1	26.8	27.7
Cash and cash equivalents at end of the year	40.0	24.1	26.8
Cash paid for:
Interest, net	9.6	9.8	9.2
Income taxes, net	$ 18.3	$ 9.6	$ 18.8