Condensed Statements of Cash Flows (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012
Operating Activities
Net income	$ 40.5	$ 38.7
Adjustments to reconcile net income to net cash and cash equivalents provided by (used for) operating activities:
Earnings of non-consolidated affiliates	(0.6)	(0.2)
Gains on disposition of property, plant and equipment	(0.1)	(0.1)
Stock-based compensation	2.1	1.4
Depreciation and amortization	32.9	25.5
Deferred income taxes	10.4	12.6
Qualified pension plan contributions	(0.2)	(0.2)
Qualified pension plan income	(5.9)	(5.9)
Change in:
Receivables	(65.7)	(42.8)
Income taxes receivable/payable	4.3	1.2
Inventories	1.8	(9.4)
Other current assets	(2.9)	(3.9)
Accounts payable and accrued liabilities	(20.9)	(16.2)
Other assets	0.6	1.5
Other noncurrent liabilities	1.9	2.5
Other operating activities	0.6	(0.3)
Net operating activities	(1.2)	4.4
Investing Activities
Capital expenditures	(30.2)	(75.9)
Proceeds from sale/leaseback of equipment	0	1.0
Proceeds from disposition of property, plant and equipment	1.8	0.2
Distributions from affiliated companies, net	0.1	0
Restricted cash activity	1.2	17.6
Other investing activities	0.1	0.3
Net investing activities	(27.0)	(56.8)
Financing Activities
Long-term debt repayments	(11.4)	0
Earn out payment - SunBelt	(17.1)	(15.3)
Common stock repurchased and retired	(4.6)	(1.2)
Stock options exercised	4.2	0.3
Excess tax benefits from stock-based compensation	0.9	0.4
Dividends paid	(16.0)	(16.0)
Net financing activities	(44.0)	(31.8)
Net decrease in cash and cash equivalents	(72.2)	(84.2)
Cash and cash equivalents, beginning of period	165.2	304.8
Cash and cash equivalents, end of period	93.0	220.6
Cash paid for interest and income taxes:
Interest	12.6	7.5
Income taxes, net of refunds	7.4	7.1
Non-cash investing activities:
Capital expenditures included in accounts payable and accrued liabilities	$ 8.0	$ 20.7