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General Accounting Matters (Details) (USD $)
In Millions, unless otherwise specified
 3 Months Ended 6 Months Ended
Jun. 30, 2013
Jun. 30, 2012
Mar. 31, 2012
Jun. 30, 2013
Jun. 30, 2012
Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]            
Provision for (benefit from) income taxes $ 20.4 $ 8.5   $ 26.8 $ (25.9)  
Increase (decrease) in provision for income taxes compared to prior period 11.9     52.7    
Deferred income tax expense due to changes in Texas Margin Tax 20.3          
Current income tax benefit due to changes in Texas Margin Tax (7.2)          
Income tax expense due to changes in Texas Margin Tax 13.1     13.1    
Income tax benefit from the conversion of company structure     46.5      
Cash payments for federal and state income taxes       22.0    
Other Nonoperating Income (Expense) [Abstract]            
Gain on sales of available-for-sale securities of Energy Transfer Equity 0 [1] 15.5 [1]   0 [1] 68.8 [1]  
Distribution income from Energy Transfer Equity 0 0   0 4.1  
Other (0.6) (2.4)   (0.9) (1.4)  
Total (0.6) 13.1   (0.9) 71.5  
Restricted cash [Abstract]            
Restricted cash 26.3     26.3   4.3
Allowance for Doubtful Accounts, Current [Member]
            
Movement in valuation allowances and reserves [Roll Forward]            
Balance at beginning of period     13.4 13.2 13.4  
Charged to costs and expenses       0.4 0  
Deductions       (1.4) (0.4)  
Balance at end of period $ 12.2 $ 13.0   $ 12.2 $ 13.0  
[1] See Note 7 for information regarding the liquidation of our investment in limited partnership units of Energy Transfer Equity.