Condensed Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2012	Jun. 30, 2011
Operating Activities
Net income	$ 86.3	$ 175.8
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Gain on remeasurement of investment in SunBelt	0	(181.4)
Earnings of non-consolidated affiliates	(0.8)	(7.7)
Losses (gains) on disposition of property, plant and equipment	0.1	(0.8)
Stock-based compensation	2.5	2.9
Depreciation and amortization	52.1	48.6
Deferred income taxes	18.6	88.7
Qualified pension plan contributions	(0.4)	(0.5)
Qualified pension plan income	(12.5)	(12.7)
Change in:
Receivables	(42.3)	(95.5)
Income taxes receivable	(5.6)	1.6
Inventories	(21.0)	(22.4)
Other current assets	(1.2)	(5.0)
Accounts payable and accrued liabilities	(7.2)	25.3
Other assets	4.3	(0.8)
Other noncurrent liabilities	(4.3)	3.6
Other operating activities	(0.2)	(2.2)
Net operating activities	68.4	17.5
Investing Activities
Capital expenditures	(145.8)	(63.4)
Business acquired in purchase transaction, net of cash acquired	0	(123.4)
Proceeds from sale/leaseback of equipment	3.5	0
Proceeds from disposition of property, plant and equipment	0.9	2.2
Distributions from affiliated companies, net	0	1.2
Restricted cash activity	26.3	4.2
Other investing activities	(0.5)	2.3
Net investing activities	(115.6)	(176.9)
Financing Activities
Long-term debt repayments	(7.7)	0
Earn out payment - SunBelt	(15.3)	0
Common stock repurchased and retired	(3.1)	0
Stock options exercised	0.5	7.3
Excess tax benefits from stock-based compensation	0.4	2.0
Dividends paid	(32.0)	(32.0)
Deferred debt issuance costs	(1.8)	0
Net financing activities	(59.0)	(22.7)
Net decrease in cash and cash equivalents	(106.2)	(182.1)
Cash and cash equivalents, beginning of period	304.8	458.6
Cash and cash equivalents, end of period	198.6	276.5
Cash paid for interest and income taxes:
Interest	11.0	12.2
Income taxes, net of refunds	20.7	15.3
Non-cash investing activities:
Capital expenditures included in accounts payable and accrued liabilities	$ 14.2	$ (3.5)