Statements Of Consolidated and Combined Operations - USD ($)
shares in Millions, $ in Millions
3 Months Ended 8 Months Ended 9 Months Ended
Sep. 30, 2016
Sep. 30, 2015
Sep. 30, 2015
Sep. 30, 2016
Sep. 30, 2015
Operating Revenues          
Transportation revenues $ 269.8 $ 265.8   $ 836.4 $ 751.0
Transportation revenues-affiliated 0.0 0.0   0.0 47.1
Storage revenues 48.9 49.5   147.7 122.3
Storage revenues-affiliated 0.0 0.0   0.0 26.2
Other revenues 7.8 4.7   19.1 28.2
Total Operating Revenues 326.5 320.0   1,003.2 974.8
Operating Expenses          
Operation and maintenance 152.2 144.9   357.5 392.9
Operation and maintenance-affiliated 116.2 37.4   198.1 112.1
Depreciation and amortization 38.8 33.4   114.1 98.7
Gain on sale of assets (9.8) (39.0)   (15.8) (52.6)
Impairment of Long-Lived Assets to be Disposed of 11.9 0.6   11.9 0.6
Property and other taxes 17.9 15.2   58.9 53.3
Total Operating Expenses 327.2 192.5   724.7 605.0
Equity Earnings in Unconsolidated Affiliates 16.0 15.3   48.1 44.2
Operating Income 15.3 142.8   326.6 414.0
Other Income (Deductions)          
Interest expense (0.3) (1.2)   (2.8) (1.2)
Interest expense-affiliated (8.4) (6.4)   (22.6) (24.1)
Other, net 14.3 9.4   30.3 18.6
Total Other Income (Deductions), net 5.6 1.8   4.9 (6.7)
Income before Income Taxes 20.9 144.6   331.5 407.3
Income Taxes 0.0 0.0   0.1 23.7
Income (Loss), Including Portion Attributable to Noncontrolling Interest 20.9 144.6 $ 340.9 331.4 383.6
Net Income 20.9 144.6 340.9 331.4 $ 383.6
Income (Loss) Attributable to Noncontrolling Interest 18.0 122.6 289.3    
Net Income (Loss) Allocated to Limited Partners $ 2.9 $ 22.0 $ 51.6 $ 48.3  
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 $ 0.03 $ 0.22 $ 0.51 $ 0.46  
Weighted average limited partner units outstanding (basic and diluted)          
Weighted Average Number of Shares Outstanding, Basic and Diluted 100.6 100.6 100.6 100.6  
Common Units          
Other Income (Deductions)          
Net Income (Loss) Allocated to Limited Partners $ 2.9 $ 11.8 $ 27.9 $ 25.9  
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 $ 0.05 $ 0.22 $ 0.52 $ 0.48  
Weighted average limited partner units outstanding (basic and diluted)          
Weighted Average Number of Shares Outstanding, Basic and Diluted 53.8 53.8 53.8 53.8  
Subordinated Units          
Other Income (Deductions)          
Net Income (Loss) Allocated to Limited Partners $ 0.0 $ 10.2 $ 23.7 $ 20.1  
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 $ 0.00 $ 0.22 $ 0.51 $ 0.43  
Weighted average limited partner units outstanding (basic and diluted)          
Weighted Average Number of Shares Outstanding, Basic and Diluted 46.8 46.8 46.8 46.8  
Noncontrolling Interest          
Other Income (Deductions)          
Income (Loss), Including Portion Attributable to Noncontrolling Interest     $ 289.3 $ 283.1  
Net Income     289.3 $ 283.1  
Predecessor | Parent          
Other Income (Deductions)          
Income (Loss), Including Portion Attributable to Noncontrolling Interest     0.0    
Net Income     $ 0.0