Subsequent Events (Details) - USD ($) $ / shares in Units, $ in Millions |
3 Months Ended | 12 Months Ended | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
Feb. 17, 2016 |
Sep. 30, 2015 |
Jun. 30, 2015 |
Mar. 31, 2015 |
Dec. 31, 2014 |
Sep. 30, 2014 |
Jun. 30, 2014 |
Mar. 31, 2014 |
Dec. 31, 2013 |
Sep. 30, 2013 |
Jun. 30, 2013 |
Mar. 31, 2013 |
Dec. 31, 2012 |
Dec. 31, 2015 |
|
| Subsequent Event [Line Items] | ||||||||||||||
| Distribution common unit (in dollars per share) | $ 0 | $ 0.39 | $ 0.45 | $ 0.41 | $ 0.27 | $ 0.33 | $ 0.38 | $ 0.43 | $ 0.36 | $ 0.583 | $ 0.610 | $ 0.192 | ||
| Total cash distributions paid | $ 0.0 | $ 28.5 | $ 32.9 | $ 30.0 | $ 19.7 | $ 24.1 | $ 27.8 | $ 31.4 | $ 26.3 | $ 42.6 | $ 44.6 | $ 14.0 | ||
| Cash distributions paid and to be paid (in dollars per share) | $ 1.11 | |||||||||||||
| Subsequent Event | ||||||||||||||
| Subsequent Event [Line Items] | ||||||||||||||
| Distribution common unit (in dollars per share) | $ 0.27 | |||||||||||||
| Total cash distributions paid | $ 19.7 | |||||||||||||