Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Sep. 30, 2018	Dec. 31, 2017
Components of accounts payable and accrued liabilities [Abstract]
Commodities	$ 975.5	$ 711.5
Other goods and services	518.7	289.7
Interest	84.0	54.4
Income and other taxes	90.4	27.1
Compensation and benefits	47.7	52.8
Preferred Series A dividends payable	22.9	22.9
Other	20.2	21.7
Accounts payable and accrued liabilities	2,088.4	1,186.9
Permian Acquisition [Member]
Components of accounts payable and accrued liabilities [Abstract]
Permian Acquisition contingent consideration, estimated current portion	$ 329.0	$ 6.8