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Provision for Income Taxes (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Current: |  |  |  |  |  |
Federal | $ 18.9 |  | $ (4.0) |  | $ 2.2 |
State | 28.9 |  | 18.9 |  | 16.0 |
Foreign | 1.2 |  | 0.2 |  | 0 |
Total current | 49.0 |  | 15.1 |  | 18.2 |
Deferred: |  |  |  |  |  |
Federal | (64.7) |  | 11.5 |  | 5.3 |
State | (1.4) |  | 0.8 |  | 2.9 |
Foreign | (0.1) |  | (0.2) |  | (0.3) |
Total deferred | (66.2) |  | 12.1 |  | 7.9 |
Total provision for (benefit from) income taxes | (17.2) |  | 27.2 |  | 26.1 |
Reconciliation of the provision for income taxes [Abstract] |  |  |  |  |  |
Pre-Tax Net Book Income ("NBI") | 2,410.8 |  | 2,115.5 |  | 1,409.8 |
Texas Margin Tax | 23.5 | [1] | 19.1 | [1] | 18.3 | [1]
State income taxes (net of federal benefit) | 5.3 |  | 0.5 |  | 0.4 |
Federal income taxes computed by applying the federal statutory rate to NBI of corporate entities | (1.6) |  | 5.0 |  | 8.0 |
Valuation allowance | (2.0) |  | (0.2) |  | 0 |
Expiration of tax net operating loss | 2.4 |  | 0.2 |  | 0 |
Tax gain on conversion of corporate subsidiaries into limited liability companies | (45.3) |  | 0 |  | 0 |
Other permanent differences | 0.5 |  | 2.6 |  | (0.6) |
Total provision for (benefit from) income taxes | (17.2) |  | 27.2 |  | 26.1 |
Effective income tax rate (in hundredths) | (0.70%) |  | 1.30% |  | 1.90% |
Deferred tax assets: |  |  |  |  |  |
Net operating loss carryovers | 0.2 | [2] | 17.8 | [2] |  |
Employee benefit plans | 0.1 |  | 3.0 |  |  |
Deferred revenue | 0 |  | 1.5 |  |  |
Equity investment in partnerships | 0 |  | 0.9 |  |  |
AROs | 0 |  | 0.1 |  |  |
Accruals | 1.5 |  | 1.6 |  |  |
Total deferred tax assets | 1.8 |  | 24.9 |  |  |
Valuation allowance | 0 | [3] | 2.0 | [3] |  |
Net deferred tax assets | 1.8 |  | 22.9 |  |  |
Less: Deferred tax liabilities: |  |  |  |  |  |
Property, plant and equipment | 23.7 |  | 112.1 |  |  |
Equity investment in partnerships | 0.6 |  | 0 |  |  |
Total deferred tax liabilities | 24.3 |  | 112.1 |  |  |
Total net deferred tax liabilities | 22.5 |  | 89.2 |  |  |
Current portion of total net deferred tax assets | 0 |  | 2.0 |  |  |
Long-term portion of total net deferred tax liabilities | $ 22.5 |  | $ 91.2 |  |  |
Operating loss carryforwards expiration period | between 2013 and 2028 |  |  |  |  |
[1] | Although the Texas Margin Tax is not considered a state income tax, it has the characteristics of an income tax since it is determined by applying a tax rate to a base that considers our Texas-sourced revenues and expenses.
[2] | These losses expire in various years between 2013 and 2028 and are subject to limitations on their utilization.
[3] | We record a valuation allowance to reduce our deferred tax assets to the amount of future benefit that is more likely than not to be realized.

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- Definition The amount of income tax expense (benefit) for the period computed by applying the Texas margin tax. The tax is assessed on Texas sourced taxable margin which is defined as the lesser of (i) 70% of total revenue or (ii) total revenue less (a) cost of goods sold or (b) compensation and benefits. + References No definition available. + Details
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- Definition The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the year/accounting period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to all other items not otherwise listed in the existing taxonomy. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 + Details
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- Definition The portion of the difference, between total income tax expense or benefit as reported in the Income Statement for the period and the expected income tax expense or benefit computed by applying the domestic federal statutory income tax rates to pretax income from continuing operations, that is attributable to state and local income tax expense or benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32698-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher SEC -Name Regulation S-X (SX) -Number 210 -Section 08 -Paragraph h -Subparagraph 1 -Article 4 + Details
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- Definition The expiration date of each operating loss carryforward included in total operating loss carryforwards, or the applicable range of such expiration dates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=6907707&loc=d3e32559-109319 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Statement of Financial Accounting Standard (FAS) -Number 109 -Paragraph 48 -Subparagraph a -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. + Details
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