Statements Of Consolidated and Combined Operations - USD ($)
shares in Millions, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2015
Jun. 30, 2014
Jun. 30, 2015
Jun. 30, 2014
Operating Revenues        
Transportation revenues $ 237.3   $ 485.2  
Transportation revenues-affiliated 18.4   47.1  
Storage revenues 36.2   72.8  
Storage revenues-affiliated 12.9   26.2  
Other revenues 10.8   23.5  
Total Operating Revenues 315.6   654.8  
Operating Expenses        
Operation and maintenance 138.0   248.0  
Operation and maintenance-affiliated 38.6   74.7  
Depreciation and amortization 33.0   65.3  
Gain on sale of assets (8.3)   (13.6)  
Property and other taxes 19.1   38.1  
Total Operating Expenses 220.4   412.5  
Equity Earnings in Unconsolidated Affiliates 14.0   28.9  
Operating Income 109.2   271.2  
Other Income (Deductions)        
Interest expense-affiliated (6.3)   (17.7)  
Other, net 4.9   9.2  
Total Other Deductions, net (1.4)   (8.5)  
Income before Income Taxes 107.8   262.7  
Income Taxes 0.0   23.7  
Net Income 107.8   239.0  
Income (Loss) Attributable to Noncontrolling Interest 91.5   166.7  
Net Income (Loss) Allocated to Limited Partners $ 16.3   $ 29.6  
Net income attributable to partners' ownership interest subsequent to IPO per limited partner unit (basic and diluted)        
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax $ 0.16   $ 0.29  
Weighted average limited partner units outstanding (basic and diluted)        
Weighted Average Number of Shares Outstanding, Basic and Diluted 100.6   100.6  
Predecessor [Member]        
Operating Revenues        
Transportation revenues   $ 260.5   $ 507.4
Transportation revenues-affiliated   18.9   47.5
Storage revenues   36.0   72.3
Storage revenues-affiliated   13.2   26.9
Other revenues   14.8   34.8
Total Operating Revenues   343.4   688.9
Operating Expenses        
Operation and maintenance   176.1   313.9
Operation and maintenance-affiliated   29.5   57.8
Depreciation and amortization   28.8   58.5
Gain on sale of assets   (0.3)   (17.8)
Property and other taxes   17.2   35.7
Total Operating Expenses   251.3   448.1
Equity Earnings in Unconsolidated Affiliates   11.1   20.9
Operating Income   103.2   261.7
Other Income (Deductions)        
Interest expense-affiliated   (12.6)   (24.7)
Other, net   2.6   4.4
Total Other Deductions, net   (10.0)   (20.3)
Income before Income Taxes   93.2   241.4
Income Taxes   34.2   89.9
Net Income   $ 59.0   $ 151.5
Common Units [Member]        
Other Income (Deductions)        
Net Income (Loss) Allocated to Limited Partners $ 9.0   $ 16.1  
Net income attributable to partners' ownership interest subsequent to IPO per limited partner unit (basic and diluted)        
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax $ 0.17   $ 0.30  
Weighted average limited partner units outstanding (basic and diluted)        
Weighted Average Number of Shares Outstanding, Basic and Diluted 53.8   53.8  
Subordinated Units [Member]        
Other Income (Deductions)        
Net Income (Loss) Allocated to Limited Partners $ 7.3   $ 13.5  
Net income attributable to partners' ownership interest subsequent to IPO per limited partner unit (basic and diluted)        
Net Income (Loss), Per Outstanding Limited Partnership and General Partnership Unit, Basic and Diluted, Net of Tax $ 0.16   $ 0.29  
Weighted average limited partner units outstanding (basic and diluted)        
Weighted Average Number of Shares Outstanding, Basic and Diluted 46.8   46.8