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Subsequent Events (Details) - Subsequent event - USD ($)
$ in Millions
Apr. 12, 2017
Apr. 10, 2017
Subsequent Event    
Financing Transaction closed $ 2,400.0  
Right Offering and Backstop commitment fee $ 580.0  
Stock Incentive Plan 2017    
Subsequent Event    
Percent of equity reserved for emloyees 7.50%  
New Equity Issued 194,991,656  
Stock Incentive Plan 2017 | Holdco Noteholders    
Subsequent Event    
New Equity Issued 70,579,367  
Stock Incentive Plan 2017 | Holdco Equityholders    
Subsequent Event    
New Equity Issued 80,022,410  
Stock Incentive Plan 2017 | Commitment premium due    
Subsequent Event    
New Equity Issued 2,512,623  
Stock Incentive Plan 2017 | Backstop obligation    
Subsequent Event    
New Equity Issued 18,844,363  
Stock Incentive Plan 2017 | Rights offering    
Subsequent Event    
New Equity Issued 23,032,893  
Unsecured debt | Private Placement    
Subsequent Event    
Notes Issued   $ 1,460.0
Unsecured debt | Unsecured Notes Due 2022    
Subsequent Event    
Debt Instrument Face Amount $ 700.0  
Unsecured debt | Unsecured Notes Due 2025    
Subsequent Event    
Debt Instrument Face Amount $ 500.0  
Term loan credit facility    
Subsequent Event    
Debt instrument term 7 years  
Line Of Credit Facility Current Borrowing Capacity $ 800.0  
Revolving credit facility | Credit facility due 2022    
Subsequent Event    
Debt Instrument Maturity Date Jan. 12, 2022  
Line Of Credit Facility Current Borrowing Capacity $ 400.0  
JPMorgan | Unsecured debt    
Subsequent Event    
Debt extinguishment $ 1,000.0  
Rockie Express Pipeline | Sempra    
Subsequent Event    
Claims settled   $ 57.0
Payment date   May 27, 2017