Condensed Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
9 Months Ended
Sep. 30, 2012
Sep. 30, 2011
Operating Activities    
Net income $ 115.0 $ 223.0
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 (2.0) (8.5)
Gains on disposition of property, plant and equipment (0.9) (4.8)
Stock-based compensation 4.2 4.3
Depreciation and amortization 78.7 74.1
Deferred income taxes 34.5 93.1
Qualified pension plan contributions (0.6) (0.7)
Qualified pension plan income (18.6) (19.5)
Change in:    
Receivables (48.6) (79.6)
Income taxes receivable (11.7) 3.5
Inventories (1.3) (6.7)
Other current assets 0.7 0.3
Accounts payable and accrued liabilities 15.0 11.6
Other assets 4.7 (0.2)
Other noncurrent liabilities (10.0) 6.1
Other operating activities (0.5) (2.2)
Net operating activities 158.6 112.4
Investing Activities    
Capital expenditures (210.8) (128.4)
Business acquired in purchase transaction, net of cash acquired (312.3) (123.4)
Proceeds from sale/leaseback of equipment 3.5 0
Proceeds from disposition of property, plant and equipment 3.7 6.2
Distributions from affiliated companies, net 0.5 1.1
Restricted cash activity 33.2 30.4
Other investing activities (0.4) 2.3
Net investing activities (482.6) (211.8)
Financing Activities    
Long-term debt borrowings 200.0 0
Long-term debt repayments (7.7) 0
Earn out payment - SunBelt (15.3) 0
Common stock repurchased and retired (3.1) (2.2)
Stock options exercised 1.3 7.3
Excess tax benefits from stock-based compensation 0.7 2.0
Dividends paid (48.0) (48.0)
Deferred debt issuance costs (5.6) 0
Net financing activities 122.3 (40.9)
Net decrease in cash and cash equivalents (201.7) (140.3)
Cash and cash equivalents, beginning of period 304.8 458.6
Cash and cash equivalents, end of period 103.1 318.3
Cash paid for interest and income taxes:    
Interest 18.4 19.6
Income taxes, net of refunds 28.5 34.4
Non-cash investing activities:    
Capital expenditures included in accounts payable and accrued liabilities $ 20.2 $ (4.2)