Statements of Consolidated and Combined Equity and Partners' Capital (Parenthetical) $ in Millions |
8 Months Ended |
|---|---|
|
Sep. 30, 2015
USD ($)
| |
| Net proceeds from IPO | $ 1,168.4 |
| Common Units | Limited Partner | |
| 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 | |
| Equity Method Investment, Percent Not Contributed to Partnership | 1.00% |
| Hardy Storage | Predecessor | |
| Equity Method Investment, Ownership Percentage | 50.00% |