Document And Entity Information - shares
 3 Months Ended
Mar. 31, 2016
Apr. 29, 2016
Document Information [Line Items]    
Document Type 10-Q  
Amendment Flag false  
Document Period End Date Mar. 31, 2016  
Document Fiscal Year Focus 2016  
Document Fiscal Period Focus Q1  
Entity Registrant Name COLUMBIA PIPELINE PARTNERS LP/DE  
Entity Central Index Key 0001420783  
Current Fiscal Year End Date --12-31  
Entity Filer Category Non-accelerated Filer  
Common Units    
Document Information [Line Items]    
Entity Units Outstanding   53,834,784
Subordinated Units    
Document Information [Line Items]    
Entity Units Outstanding   46,811,398