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v3.8.0.1

Provision for Income Taxes (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |  |
Federal |  | $ 0.1 | $ (0.5) | $ 0.9
State |  | 18.5 | 16.7 | 15.5
Foreign |  | 1.0 | 0.6 | 1.7
Total current |  | 19.6 | 16.8 | 18.1
Deferred: |  |  |  |
Federal |  | (1.8) | 1.1 | (1.4)
State |  | 7.9 | 5.2 | (19.2)
Foreign |  | 0.0 | 0.3 | 0.0
Total deferred |  | 6.1 | 6.6 | (20.6)
Total provision for (benefit from) income taxes |  | 25.7 | 23.4 | (2.5)
Reconciliation of the provision for (benefit from) income taxes [Abstract] |  |  |  |
Pre-Tax Net Book Income ("NBI") |  | 2,881.3 | 2,576.4 | 2,555.9
Texas Margin Tax | [1] | 26.4 | 22.1 | (3.7)
State income taxes (net of federal benefit) |  | 0.5 | 0.2 | 0.7
Federal income taxes computed by applying the federal statutory rate to NBI of corporate entities |  | 0.1 | 0.8 | 1.1
Other permanent differences |  | (1.3) | 0.3 | (0.6)
Total provision for (benefit from) income taxes |  | $ 25.7 | $ 23.4 | $ (2.5)
Effective income tax rate |  | 0.90% | 0.90% | (0.10%)
Deferred tax assets: |  |  |  |
Net operating loss carryovers | [2] | $ 0.2 | $ 0.2 |
Accruals |  | 1.4 | 1.6 |
Total deferred tax assets |  | 1.6 | 1.8 |
Less: Deferred tax liabilities: |  |  |  |
Property, plant and equipment |  | 58.0 | 50.5 |
Equity investment in partnerships |  | 2.1 | 3.7 |
Total deferred tax liabilities |  | 60.1 | 54.2 |
Total net deferred tax liabilities |  | $ 58.5 | $ 52.4 |
[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. During 2015, certain legislative changes were enacted to the Texas Margin Tax, which reduced the tax rate for business entities that operate within the state.
[2] | These losses expire in various years between 2018 and 2033 and are subject to limitations on their utilization.

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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 Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to state and local income tax expense (benefit). + References Reference 1: 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=84230637&loc=d3e32698-109319 Reference 2: 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=84230637&loc=d3e32687-109319 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 + Details
Name: | us-gaap_IncomeTaxReconciliationStateAndLocalIncomeTaxes
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | debit
Period Type: | duration