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Provision for Income Taxes (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 12 Months Ended
Jun. 30, 2013
Dec. 31, 2013
Dec. 31, 2012
Dec. 31, 2011
Current:        
Federal   $ (0.5) $ 18.9 $ (4.0)
State   19.3 28.9 18.9
Foreign   0.8 1.2 0.2
Total current   19.6 49.0 15.1
Deferred:        
Federal   (0.5) (64.7) 11.5
State   38.9 (1.4) 0.8
Foreign   (0.5) (0.1) (0.2)
Total deferred   37.9 (66.2) 12.1
Total provision for (benefit from) income taxes   57.5 (17.2) 27.2
Reconciliation of the provision for income taxes [Abstract]        
Pre-Tax Net Book Income ("NBI")   2,664.6 2,410.8 2,115.5
Texas Margin Tax   58.3 [1] 23.5 [1] 19.1 [1]
State income taxes (net of federal benefit)   (0.1) 5.3 0.5
Federal income taxes computed by applying the federal statutory rate to NBI of corporate entities   (1.4) (1.6) 5.0
Valuation allowance   0 (2.0) (0.2)
Expiration of tax net operating loss   0.1 2.4 0.2
Tax gain on conversion of corporate subsidiaries into limited liability companies   0 (45.3) 0
Other permanent differences   0.6 0.5 2.6
Total provision for (benefit from) income taxes   57.5 (17.2) 27.2
Effective income tax rate (in hundredths)   2.20% (0.70%) 1.30%
Deferred tax assets:        
Net operating loss carryovers   0.1 [2] 0.2 [2]  
Employee benefit plans   0.2 0.1  
Accruals   2.0 1.5  
Total deferred tax assets   2.3 1.8  
Valuation allowance   0 [3] 0 [3]  
Net deferred tax assets   2.3 1.8  
Less: Deferred tax liabilities:        
Property, plant and equipment   59.8 23.7  
Equity investment in partnerships   2.9 0.6  
Total deferred tax liabilities   62.7 24.3  
Total net deferred tax liabilities   60.4 22.5  
Current portion of total net deferred tax assets   0.4 0  
Long-term portion of total net deferred tax liabilities   60.8 22.5  
Income tax expense due to changes in Texas Margin Tax 19.6      
Income tax benefit from the conversion of company structure     $ 45.3  
Operating loss carryforwards expiration period   between 2014 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 2014 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.