CONDENSED CONSOLIDATED STATEMENTS OF CASH FLOWS (Unaudited) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012		Mar. 31, 2011
Cash flow from operating activities:
Net income (loss)	$ 13.5	[1]	$ 13.1	[1]
Adjustments to reconcile from net income (loss) to net cash provided by (used in) operating activities:
Depreciation, depletion, and amortization	10.7	[1]	9.5	[1]
Other non-cash charges	3.2	[1]	1.3	[1]
Changes in assets and liabilities, net of effects of acquisitions:
Decrease (increase) in current assets	2.4	[1]	(19.5)	[1]
Decrease (increase) in noncurrent assets	(0.9)	[1]	0	[1]
Increase (decrease) in current liabilities	(9.5)	[1]	5.6	[1]
Increase (decrease) in noncurrent liabilities	1.1	[1]	0.3	[1]
Net cash provided by (used in) operating activities	20.5	[1]	10.3	[1]
Cash flow from investing activities:
Capital expenditures	(16.6)	[1]	(10.4)	[1]
Proceeds from sale of interest in joint venture	0.6	[1]	0	[1]
Other	0.6	[1]	0.6	[1]
Net cash (used in) investing activities	(15.4)	[1]	(9.8)	[1]
Cash flow from financing activities:
Net change in outstanding debt	(10.1)	[1]	(3.6)	[1]
Proceeds from sales of treasury stock	3.4	[1]	2.8	[1]
Dividends	(5.7)	[1]	(5.7)	[1]
Excess tax benefits from stock-based compensation	0.1	[1]	0.2	[1]
Net cash provided by (used in) financing activities	(12.3)	[1]	(6.3)	[1]
Effect of foreign currency rate changes on cash	0	[1]	0.2	[1]
Net increase (decrease) in cash and cash equivalents	(7.2)	[1]	(5.6)	[1]
Cash and cash equivalents at beginning of period	24.1	[1],[2]	26.8	[1]
Cash and cash equivalents at end of period	$ 16.9	[1]	$ 21.2	[1]

[1] Restated

[2] Condensed from audited financial statements.