Initial Public Offering (Schedule fo Change From Net Income Attributable to the Partnership and Transfers to Noncontrolling Interest) (Details) - USD ($) $ in Millions |
2 Months Ended | 3 Months Ended | 11 Months Ended | 12 Months Ended | ||
|---|---|---|---|---|---|---|
Mar. 31, 2015 |
Dec. 31, 2015 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Dec. 31, 2015 |
Dec. 31, 2015 |
|
| Initial Public Offering [Line Items] | ||||||
| Net Income (Loss) Allocated to Limited Partners | $ 13.3 | $ 22.4 | $ 22.0 | $ 16.3 | $ 74.0 | $ 74.0 |
| Noncontrolling Interest, Increase from Subsidiary Equity Issuance | 0.0 | |||||
| Change from net income attributable to the Partnership and transfers to noncontrolling interest | (350.4) | |||||
| Noncontrolling Interest | ||||||
| Initial Public Offering [Line Items] | ||||||
| Noncontrolling Interest, Increase from Subsidiary Equity Issuance | $ (424.4) | |||||