Condensed Consolidated Balance Sheets (Unaudited) (Parenthetical) - USD ($) $ in Millions	Jun. 30, 2017	Dec. 31, 2016
Allowance for accounts and notes receivable	$ 15.9	$ 14.3
Property and equipment, accumulated depreciation and amortization	$ 545.0	$ 474.5
Partnership preferred units, authorized (shares)	68,530,939	68,530,939
Partnership preferred units, issued (shares)	68,530,939	68,530,939
Partnership preferred units; outstanding (shares)	68,530,939	68,530,939
Class A common units
Class A common units, issued (shares)	202,006,067	202,006,067
Class A common units, outstanding (shares)	202,006,067	202,006,067
Partnership Exchangeable Units
Partnership exchangeable units, issued (shares)	226,848,674	226,995,404
Partnership exchangeable units, outstanding (shares)	226,848,674	226,995,404

Amount of accumulated depreciation, depletion and amortization for physical assets used in the normal conduct of business to produce goods and services.

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