Selected Quarterly Financial Data (Tables)

12 Months Ended

Dec. 31, 2016

Quarterly Financial Information Disclosure [Abstract]

Selected Quarterly Financial Data (Unaudited)

(in millions of dollars, except for per unit data)	Total Revenues		Income Before Income Taxes		Net Income		Net Income Attributable to the Partnership		Limited Partners' Interest in Net Income Attributable to the Partnership		Net Income per Common Unit - Basic and Diluted
2016
First	$	76.7	$	68.0	$	68.0	$	55.3	$	52.2	$	0.36
Second	71.1		66.3		66.3		63.8		58.8		0.35
Third	67.9		58.8		58.8		56.3		49.1		0.28
Fourth	75.6		72.3		72.3		69.5		59.8		0.34
2015
First	$	65.9	$	49.3	$	49.1	23.6		23.1		0.17
Second	79.8		60.8		60.7		32.2		31.5		0.23
Third	96.2		90.3		90.6		54.3		52.8		0.37
Fourth	84.6		72.4		72.5		57.0		54.7		0.38