Accounts Payable and Accrued Liabilities (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018
Components of accounts payable and accrued liabilities [Abstract]
Commodities	$ 779.3	$ 721.9
Other goods and services	388.0	478.6
Interest	91.6	79.9
Income and other taxes	40.5	47.7
Compensation and benefits	26.5	57.3
Preferred Series A dividends payable	22.9	22.9
Other	13.5	20.8
Accounts payable and accrued liabilities	1,680.2	1,737.3
Permian Acquisition [Member]
Components of accounts payable and accrued liabilities [Abstract]
Permian Acquisition contingent consideration	$ 317.9	$ 308.2