| Change From Net Income Attributable to the Partnership and Transfers to Noncontrolling Interest |
| | | | | | | | | | Three Months Ended
March 31, | (in millions) | 2016 | | 2015 | Net income attributable to the Partnership | $ | 27.3 |
| | $ | 13.3 |
| Decrease in partnership equity for the purchase of an additional 8.4 percent interest in Columbia OpCo | — |
| | (424.4 | ) | Change from net income attributable to the Partnership and transfers to noncontrolling interest | $ | 27.3 |
| | $ | (411.1 | ) |
|