Condensed Consolidated Balance Sheets (Parenthetical) - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Assets:
Allowance for bad debt	$ 0.1	$ 0.3
Property and equipment accumulated depreciation	2,124.1	1,757.6
Intangible assets accumulated amortization	171.6	$ 54.6
Liabilities:
Current installment payable discount	0.5
Noncurrent installment payable discount	$ 26.3
Members' equity:
Common units issued	180,049,316	164,242,160
Common units outstanding	180,049,316	164,242,160