Statements of Consolidated and Combined Balance Sheets - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
Current Assets    
Cash and cash equivalents $ 136.1 $ 0.5
Accounts receivable (less reserve of $0.3 and $0.3, respectively) 123.5  
Accounts receivable-affiliated 656.7  
Materials and supplies, at average cost 28.2  
Exchange gas receivable 24.8  
Regulatory assets 5.3  
Deferred property taxes 32.3  
Deferred income taxes 0.0  
Prepayments and other 10.1  
Total Current Assets 1,017.0  
Investments    
Unconsolidated affiliates 443.5  
Other investments 5.6  
Total Investments 449.1  
Property, Plant and Equipment    
Property, plant and equipment 8,394.7  
Accumulated depreciation and amortization (2,968.1)  
Net Property, Plant and Equipment 5,426.6  
Other Noncurrent Assets    
Regulatory assets 125.1  
Goodwill 1,975.5  
Postretirement and postemployment benefits assets 117.0  
Deferred charges and other 10.8  
Total Other Noncurrent Assets 2,228.4  
Total Assets 9,121.1  
Current Liabilities    
Current portion of long-term debt-affiliated 0.0  
Short-term borrowings 20.0  
Short-term borrowings-affiliated 67.1  
Accounts payable 66.0  
Accounts payable-affiliated 41.5  
Customer deposits 41.6  
Taxes accrued 78.3  
Exchange gas payable 24.4  
Deferred revenue 13.7  
Regulatory liabilities 9.0  
Legal and environmental 1.6  
Accrued capital expenditures 146.3  
Other accruals 65.8  
Total Current Liabilities 575.3  
Noncurrent Liabilities    
Long-term debt-affiliated 630.9  
Deferred income taxes 1.0  
Accrued liability for postretirement and postemployment benefits 37.4  
Regulatory liabilities 292.0  
Asset retirement obligations 23.8 23.2
Other noncurrent liabilities 57.6  
Total Noncurrent Liabilities 1,042.7  
Total Liabilities 1,618.0  
Equity and Partners' Capital    
Net parent investment 0.0  
Accumulated other comprehensive loss [1] (4.1) (16.7)
Total Columbia Pipeline Partners LP partners' equity and capital 1,247.6  
Noncontrolling Interest in Columbia OpCo 6,255.5  
Total Equity and Partners' Capital 7,503.1 4,171.3
Total Liabilities and Equity and Partners' Capital 9,121.1  
Predecessor [Member]    
Current Assets    
Cash and cash equivalents   0.5
Accounts receivable (less reserve of $0.3 and $0.3, respectively)   149.3
Accounts receivable-affiliated   153.8
Materials and supplies, at average cost   24.9
Exchange gas receivable   34.8
Regulatory assets   6.1
Deferred property taxes   48.9
Deferred income taxes   24.6
Prepayments and other   14.8
Total Current Assets   457.7
Investments    
Unconsolidated affiliates   444.3
Other investments   6.2
Total Investments   450.5
Property, Plant and Equipment    
Property, plant and equipment   7,931.6
Accumulated depreciation and amortization   (2,971.4)
Net Property, Plant and Equipment   4,960.2
Other Noncurrent Assets    
Regulatory assets   151.9
Goodwill   1,975.5
Postretirement and postemployment benefits assets   102.7
Deferred charges and other   9.0
Total Other Noncurrent Assets   2,239.1
Total Assets   8,107.5
Current Liabilities    
Current portion of long-term debt-affiliated   115.9
Short-term borrowings   0.0
Short-term borrowings-affiliated   247.3
Accounts payable   56.1
Accounts payable-affiliated   49.9
Customer deposits   13.4
Taxes accrued   106.9
Exchange gas payable   34.7
Deferred revenue   22.2
Regulatory liabilities   1.3
Legal and environmental   1.5
Accrued capital expenditures   61.1
Other accruals   67.4
Total Current Liabilities   777.7
Noncurrent Liabilities    
Long-term debt-affiliated   1,472.8
Deferred income taxes   1,239.0
Accrued liability for postretirement and postemployment benefits   44.7
Regulatory liabilities   294.3
Asset retirement obligations   23.2
Other noncurrent liabilities   84.5
Total Noncurrent Liabilities   3,158.5
Total Liabilities   3,936.2
Equity and Partners' Capital    
Net parent investment   4,188.0
Accumulated other comprehensive loss   (16.7)
Total Columbia Pipeline Partners LP partners' equity and capital   4,171.3
Noncontrolling Interest in Columbia OpCo   0.0
Total Equity and Partners' Capital   4,171.3
Total Liabilities and Equity and Partners' Capital   8,107.5
Common Units [Member]    
Equity and Partners' Capital    
Limited Partners' Capital Account 952.7  
Common Units [Member] | Predecessor [Member]    
Equity and Partners' Capital    
Limited Partners' Capital Account   0.0
Subordinated Units [Member]    
Equity and Partners' Capital    
Limited Partners' Capital Account $ 299.0  
Subordinated Units [Member] | Predecessor [Member]    
Equity and Partners' Capital    
Limited Partners' Capital Account   $ 0.0
[1] All amounts prior to the IPO are net of tax. Amounts in parentheses indicate debits.