Net Earnings per Common Unit (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Unit [Abstract]

Schedule of calculation for net earnings per common unit

The following table provides a calculation for net earnings per common unit for the three and six months ended June 30, 2017 and 2016:

	Three months ended   June 30,				Six months ended   June 30,
	2017		2016		2017		2016
	(in millions, except per unit amounts)
Basic earnings per common unit:
Net earnings	$	39.5	$	98.7	$	81.7	$	136.4
Less: Net earnings allocable to General Partner	11.7		38.1		14.7		48.7
Less: Net earnings allocable to Class B common units	0.4		0.9		0.8		1.3
Net earnings allocable to common units	$	27.4	$	59.7	$	66.2	$	86.4
Weighted-average common units outstanding	18.5		18.5		18.5		18.5
Net earnings per common unit	$	1.48	$	3.22	$	3.58	$	4.66