Condensed Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2012	Mar. 31, 2011
Cash flows from operating activities
Net income	$ 12.6	$ 17.9
Adjustments to reconcile net income to net cash provided by operating activities
Depreciation and amortization	51.1	48.4
Provision for loss on receivables	3.8	3.1
Asset impairment	0	1.1
Noncash portion of interest expense	2.0	2.5
Deferred income tax provision	12.4	13.9
Pension and other postretirement payments in excess of expense	(8.2)	(11.2)
Stock-based Compensation	1.3	0.9
Other, net	0.9	(0.1)
Changes in operating assets and liabilities, net of effects of acquisitions and dispositions
(Increase) decrease in receivables	(0.4)	15.4
Increase in inventory, materials, supplies, prepaids and other current assets	(5.5)	(6.8)
Decrease in accounts payable	(36.5)	(22.2)
(Decrease) increase in accrued and other current liabilities	(8.8)	8.5
Increase (decrease) in other noncurrent assets	(0.2)	0.1
Decrease in other noncurrent liabilities	(0.9)	(6.5)
Net cash provided by operating activities	23.6	65.0
Cash flows from investing activities
Capital expenditures	(84.6)	(52.4)
Other, net	0	0.1
Net cash used in investing activities	(84.6)	(52.3)
Cash flows from financing activities
Repayment of debt	(4.0)	(3.0)
Dividends paid on preferred stock	(2.6)	(2.6)
Common stock repurchase	(0.3)	0
Other, net	1.1	(0.4)
Net cash (used in) provided by financing activities	(5.8)	(6.0)
Net (decrease) increase in cash and cash equivalents	(66.8)	6.7
Cash and cash equivalents at beginning of year	73.7	77.3
Cash and cash equivalents at end of period	6.9	84.0
Noncash investing and financing transactions:
Acquisition of property by assuming debt and other noncurrent liabilities	1.4	4.5
Acquisition of property on account	$ 13.3	$ 8.1