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General Accounting Matters (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Dec. 31, 2012
Income Tax Expense (Benefit) [Abstract]      
Benefit from (provision for) income taxes $ (6.4) $ 34.4  
Income tax benefit from the conversion of company structure   46.5  
Cash payments for federal and state income taxes   22  
Other Nonoperating Income (Expense) [Abstract]      
Gain on sales of available-for-sale securities of Energy Transfer Equity 0 [1] 53.3 [1]  
Distribution income from Energy Transfer Equity 0 4.1  
Other (0.3) 1.0  
Total (0.3) 58.4  
Restricted cash [Abstract]      
Restricted cash 68.1   4.3
Allowance for Doubtful Accounts, Current [Member]
     
Movement in valuation allowances and reserves [Roll Forward]      
Balance at beginning of period 13.2 13.4  
Charged to costs and expenses 0 0.1  
Deductions (1.3) (0.5)  
Balance at end of period $ 11.9 $ 13.0  
[1] See Note 7 for information regarding the liquidation of our investment in limited partnership units of Energy Transfer Equity.