Statements Of Consolidated and Combined Equity and Partners' Capital - USD ($)
$ in Millions
Total
Parent
Noncontrolling Interest
Accumulated Other Comprehensive Loss
Limited Partner
Common Units
Limited Partner
Subordinated Units
Beginning Balance (Predecessor) at Dec. 31, 2014   $ 4,188.0        
Beginning Balance at Dec. 31, 2014 $ 4,171.3   $ 0.0 $ (16.7) $ 0.0 $ 0.0
Income (Loss), Including Portion Attributable to Noncontrolling Interest | Predecessor   42.7        
Income (Loss), Including Portion Attributable to Noncontrolling Interest 42.7   0.0 0.0 0.0 0.0
Other Comprehensive Income (Loss), Net of Tax | Predecessor   0.0        
Other Comprehensive Income (Loss), Net of Tax 0.1   0.0 0.1 0.0 0.0
Contribution of capital from parent | Predecessor   1,217.3        
Contribution of capital from parent 1,217.3   0.0 0.0 0.0 0.0
Predecessor net tax liabilities not assumed by Columbia OpCo | Predecessor   1,232.5        
Predecessor net tax liabilities not assumed by Columbia OpCo 1,222.2   0.0 (10.3) 0.0 0.0
Contributed/Noncontributed Net Parent Investment Adjustments | Predecessor   (7.7)        
Contributed/Noncontributed Net Parent Investment Adjustments (7.7)   0.0 0.0 0.0 0.0
Ending Balance (Predecessor) at Feb. 11, 2015   6,672.8        
Ending Balance at Feb. 11, 2015 6,645.9   0.0 (26.9) 0.0 0.0
Beginning Balance (Predecessor) at Dec. 31, 2014   4,188.0        
Beginning Balance at Dec. 31, 2014 4,171.3   0.0 (16.7) 0.0 0.0
Income (Loss), Including Portion Attributable to Noncontrolling Interest 131.2          
Other Comprehensive Income (Loss), Net of Tax [1] 0.1          
Predecessor net tax liabilities not assumed by Columbia OpCo [1],[2]       (10.3)    
Ending Balance at Mar. 31, 2015 7,402.9 0.0 6,162.7 (4.2) 948.4 296.0
Beginning Balance (Predecessor) at Feb. 11, 2015   6,672.8        
Beginning Balance at Feb. 11, 2015 6,645.9   0.0 (26.9) 0.0 0.0
Income (Loss), Including Portion Attributable to Noncontrolling Interest | Predecessor   0.0        
Income (Loss), Including Portion Attributable to Noncontrolling Interest 88.5   75.2 0.0 7.1 6.2
Other Comprehensive Income (Loss), Net of Tax | Predecessor   0.0        
Other Comprehensive Income (Loss), Net of Tax 0.1   0.1 0.0 0.0 0.0
Allocation of Net Investment to Unitholders | Predecessor   (6,672.8)        
Allocation of Net Investment to Unitholders 0.0   6,185.7 0.0 0.0 487.1
Allocation of Accumulated Other Comprehensive Loss to Noncontrolling Interest | Predecessor   0.0        
Allocation of Accumulated Other Comprehensive Loss to Noncontrolling Interest 0.0   (22.7) 22.7 0.0 0.0
Net proceeds from IPO | Predecessor   0.0        
Net proceeds from IPO 1,168.4   0.0 0.0 1,168.4 0.0
Purchase of additional interest in Columbia OpCo | Predecessor   0.0        
Purchase of additional interest in Columbia OpCo 0.0   424.4 0.0 (227.1) (197.3)
Distributions to the noncontrolling interest in Columbia OpCo | Predecessor   0.0        
Distributions to the noncontrolling interest in Columbia OpCo (500.0)   (500.0) 0.0 0.0 0.0
Ending Balance at Mar. 31, 2015 7,402.9 $ 0.0 6,162.7 (4.2) 948.4 296.0
Beginning Balance at Dec. 31, 2015 7,576.7   6,318.2 (4.0) 958.5 304.0
Income (Loss), Including Portion Attributable to Noncontrolling Interest 180.2   152.9 0.0 14.6 12.7
Other Comprehensive Income (Loss), Net of Tax 0.5 [3]   0.4 0.1 0.0 0.0
Quarterly distributions to unitholders (18.1)   0.0 0.0 (9.7) (8.4)
Purchase of additional interest in Columbia OpCo     0.0      
Distributions to the noncontrolling interest in Columbia OpCo (108.9)   (108.9) 0.0 0.0 0.0
Ending Balance at Mar. 31, 2016 $ 7,630.4   $ 6,362.6 $ (3.9) $ 963.4 $ 308.3
[1] All amounts prior to the IPO are net of tax. Amounts in parentheses indicate debits.
[2] Reflects the non-cash elimination of all historical current and deferred income taxes other than Tennessee state income taxes that will continue to be borne by the Partnership post-IPO.
[3] Amounts in parentheses indicate debits.