v2.4.0.6

Segment Reporting (Details) (USD $) In Millions, unless otherwise specified	3 Months Ended
	Mar. 31, 2013	Mar. 31, 2012	Dec. 31, 2012
Summarized financial information concerning our reportable segments
Gross Revenue	$ 2,397.8	$ 2,366.6
Intercompany Revenue	(399.2)	(384.2)
Net Revenue	1,998.6	1,982.4
Depreciation, Amortization, Depletion and Accretion	228.8	233.4
Operating Income (Loss)	274.2	326.9
Capital Expenditures	214.8	274.2
Total Assets	19,639.1	19,455.9	19,616.9
East [Member]
Summarized financial information concerning our reportable segments
Gross Revenue	693.8	699.1
Intercompany Revenue	(95.5)	(94.8)
Net Revenue	598.3	604.3
Depreciation, Amortization, Depletion and Accretion	61.4	59.9
Operating Income (Loss)	115.5	120.7
Capital Expenditures	32.2	67.2
Total Assets	4,891.7	4,910.6
Central [Member]
Summarized financial information concerning our reportable segments
Gross Revenue	711.2	712.6
Intercompany Revenue	(128.7)	(127.3)
Net Revenue	582.5	585.3
Depreciation, Amortization, Depletion and Accretion	72.5	72.2
Operating Income (Loss)	112.5	106.5
Capital Expenditures	44.0	44.6
Total Assets	5,650.2	5,558.9
West [Member]
Summarized financial information concerning our reportable segments
Gross Revenue	967.4	926.3
Intercompany Revenue	(171.8)	(158.7)
Net Revenue	795.6	767.6
Depreciation, Amortization, Depletion and Accretion	82.8	82.0
Operating Income (Loss)	171.3	163.4
Capital Expenditures	54.6	93.1
Total Assets	8,206.9	8,188.4
Corporate entities [Member]
Summarized financial information concerning our reportable segments
Gross Revenue	25.4	28.6
Intercompany Revenue	(3.2)	(3.4)
Net Revenue	22.2	25.2
Depreciation, Amortization, Depletion and Accretion	12.1	19.3
Operating Income (Loss)	(125.1)	(63.7)
Capital Expenditures	84.0	69.3
Total Assets	$ 890.3	$ 798.0

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Intercompany Revenue.

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Sum of the carrying amounts as of the balance sheet date of all assets that are recognized. Assets are probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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-Publisher SEC

-Name Regulation S-X (SX)

-Number 210

-Section 03

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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The cash outflow for purchases of and capital improvements on property, plant and equipment (capital expenditures), software, and other intangible assets.

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-LegacyDoc This reference is SUPERSEDED by the Accounting Standards Codification effective for interim and annual periods ending after September 15, 2009. This reference is included to help users transition from the previous accounting hierarchy and will be removed from future versions of this taxonomy.



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Total revenue from sale of goods and services rendered during the reporting period, in the normal course of business, reduced by sales returns and allowances, and sales discounts.

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Amount of total revenue for the reportable segments, including revenue from external customers, transactions with other operating segments of the same entity, and (gross) interest revenue. All considered to be "operating revenue" for purposes of the taxonomy.

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