Significant Accounting Policies (Tables)

9 Months Ended

Sep. 30, 2018

Accounting Policies [Abstract]

Summary of Effect of Adoption on Consolidated Financial Statements

The following tables summarize the effects of adoption on our consolidated financial statements:

	Three Months Ended September 30, 2018
	Pre-Adoption			Effect of Adoption			Post-Adoption
Revenues:
Sales of commodities	$	2,738.7		$	(84.6	)	$	2,654.1
Fees from midstream services		338.1			(5.8	)		332.3
Total revenues		3,076.8			(90.4	)		2,986.4
Costs and expenses:
Product purchases		2,473.9			(90.4	)		2,383.5
Income from operations		76.7			—			76.7
Income (loss) before income taxes		(15.1	)		—			(15.1	)
Net income (loss)	$	(11.2	)	$	—		$	(11.2	)

	Nine Months Ended September 30, 2018
	Pre-Adoption		Effect of Adoption			Post-Adoption
Revenues:
Sales of commodities	$	7,232.0	$	(250.6	)	$	6,981.4
Fees from midstream services		923.5		(18.6	)		904.9
Total revenues		8,155.5		(269.2	)		7,886.3
Costs and expenses:
Product purchases		6,498.9		(269.2	)		6,229.7
Income from operations		318.2		—			318.2
Income (loss) before income taxes		186.3		—			186.3
Net income (loss)	$	148.6	$	—		$	148.6