Earnings Per Unit and Dilution Computations - Components to Computer Basic and Diluted Earnings per Unit (Details) - shares shares in Millions	3 Months Ended
	Mar. 31, 2017	Mar. 31, 2016
Basic and diluted net loss per unit:
Weighted average common units outstanding (in shares)	180.2	178.7
Diluted weighted average units outstanding:
Weighted average basic common units outstanding (in shares)	180.2	178.7
Dilutive effect of restricted incentive units issued (in shares)	0.0	0.0
Total weighted average diluted common units outstanding (in shares)	180.2	178.7