Net Income per Common Share (Tables)

6 Months Ended

Jun. 30, 2017

Earnings Per Share [Abstract]

Schedule of reconciliation of the weighted average basic common shares outstanding to weighted average diluted common shares outstanding

A reconciliation of the weighted average basic common shares outstanding to the weighted average diluted common shares outstanding is as follows:

	Three Months Ended				Six Months Ended
(millions, except share and per share data) (unaudited)	June 30, 2017		June 30, 2016		June 30, 2017		June 30, 2016
Net income attributable to SP Plus Corporation	$	16.2	$	6.5	$	22.2	$	6.5
Basic weighted average common shares outstanding	22,190,421		22,344,898		22,178,143		22,336,693
Dilutive impact of share-based awards	324,813		280,573		312,226		272,750
Diluted weighted average common shares outstanding	22,515,234		22,625,471		22,490,369		22,609,443
Net income per common share
Basic	$	0.73	$	0.29	$	1.00	$	0.29
Diluted	$	0.72	$	0.29	$	0.98	$	0.29