Net Income Per Limited Partner Unit (Tables)

9 Months Ended

Sep. 30, 2015

Earnings Per Share [Abstract]

Schedule of Distributions By Partner By Class



	Three Months Ended September 30,								Nine Months Ended September 30,
(In millions)	2015				2014				2015				2014
Net income attributable to MPLX LP	$	41.5			$	29.1			$	138.3			$	92.1
Less: General partner’s distributions declared (including IDRs) ⁽¹⁾	8.8				1.5				19.0				3.4
Limited partners’ distributions declared on common units ⁽¹⁾	37.7				13.2				74.6				38.0
Limited partner’s distributions declared on subordinated units ⁽¹⁾	—				13.2				31.4				38.0
Undistributed net income (loss) attributable to MPLX LP	$	(5.0	)		$	1.2			$	13.3			$	12.7


⁽¹⁾	See Note 6 for distribution information.

Schedule of Basic and Diluted Earnings Per Unit



	Three Months Ended September 30, 2015
(In millions, except per unit data)	General Partner				Limited Partners’ Common Units				Limited Partner’s Subordinated Units				Total
Basic and diluted net income attributable to MPLX LP per unit:
Net income attributable to MPLX LP:
Distributions declared (including IDRs)	$	8.8			$	37.7			$	—			$	46.5
Undistributed net loss attributable to MPLX LP	(0.1		)		(4.9		)		—				(5.0		)
Net income attributable to MPLX LP ⁽¹⁾	$	8.7			$	32.8			$	—			$	41.5
Weighted average units outstanding:
Basic	1.6				80.4				—				82.0
Diluted	1.6				80.4				—				82.0
Net income attributable to MPLX LP per limited partner unit:
Basic					$	0.41			$	—
Diluted					$	0.41			$	—



	Three Months Ended September 30, 2014
(In millions, except per unit data)	General Partner				Limited Partners’ Common Units				Limited Partner’s Subordinated Units				Total
Basic and diluted net income attributable to MPLX LP per unit:
Net income attributable to MPLX LP:
Distributions declared (including IDRs)	$	1.5			$	13.2			$	13.2			$	27.9
Undistributed net income attributable to MPLX LP	0.3				0.5				0.4				1.2
Net income attributable to MPLX LP ⁽¹⁾	$	1.8			$	13.7			$	13.6			$	29.1
Weighted average units outstanding:
Basic	1.4				37.1				37.0				75.5
Diluted	1.4				37.1				37.0				75.5
Net income attributable to MPLX LP per limited partner unit:
Basic					$	0.37			$	0.37
Diluted					$	0.37			$	0.37



	Nine Months Ended September 30, 2015
(In millions, except per unit data)	General Partner				Limited Partners’ Common Units				Limited Partner’s Subordinated Units				Total
Basic and diluted net income attributable to MPLX LP per unit:
Net income attributable to MPLX LP:
Distributions declared (including IDRs)	$	19.0			$	74.6			$	31.4			$	125.0
Undistributed net income attributable to MPLX LP	6.6				4.6				2.1				13.3
Net income attributable to MPLX LP ⁽¹⁾	$	25.6			$	79.2			$	33.5			$	138.3
Weighted average units outstanding:
Basic	1.6				55.9				24.5				82.0
Diluted	1.6				55.9				24.5				82.0
Net income attributable to MPLX LP per limited partner unit:
Basic					$	1.42			$	1.36
Diluted					$	1.42			$	1.36



	Nine Months Ended September 30, 2014
(In millions, except per unit data)	General Partner				Limited Partners’ Common Units				Limited Partner’s Subordinated Units				Total
Basic and diluted net income attributable to MPLX LP per unit:
Net income attributable to MPLX LP:
Distributions declared (including IDRs)	$	3.4			$	38.0			$	38.0			$	79.4
Undistributed net income attributable to MPLX LP	3.2				4.8				4.7				12.7
Net income attributable to MPLX LP ⁽¹⁾	$	6.6			$	42.8			$	42.7			$	92.1
Weighted average units outstanding:
Basic	1.4				37.0				37.0				75.4
Diluted	1.4				37.1				37.0				75.5
Net income attributable to MPLX LP per limited partner unit:
Basic					$	1.16			$	1.16
Diluted					$	1.16			$	1.16


⁽¹⁾	Allocation of net income attributable to MPLX LP assumes all earnings for the period had been distributed based on the current period distribution priorities.