Statement of Consolidated and Combined Equity and Partners' Capital (Parenthetical) - Jun. 30, 2015 - Scenario, Unspecified [Domain] - USD ($) $ in Millions |
Total |
|---|---|
| Net proceeds from IPO | $ 1,168.4 |
| Common Units [Member] | Limited Partner [Member] | |
| Net proceeds from IPO | $ 1,168.4 |
| Columbia OpCo | |
| Limited Liability Company (LLC) or Limited Partnership (LP), Members or Limited Partners, Ownership Interest Additional Ownership Interest | 8.40% |
| Hardy Storage [Member] | |
| Equity Method Investment, Percent Not Contributed to Partnership | 1.00% |
| Equity Method Investment, Ownership Percentage | 50.00% |