Net Income per Common Share (Tables)

12 Months Ended

Dec. 31, 2019

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 basic weighted average common shares outstanding to diluted weighted average common shares outstanding is as follows:

	Year Ended December 31,
(millions, except share and per share data)	2019		2018		2017
Net income attributable to SP Plus Corporation	$	48.8	$	53.2	$	41.2
Basic weighted average common shares outstanding	22,080,025		22,394,542		22,195,350
Dilutive impact of share-based awards	128,007		212,681		312,938
Diluted weighted average common shares outstanding	22,208,032		22,607,223		22,508,288
Net income per common share
Basic	$	2.21	$	2.38	$	1.86
Diluted	$	2.20	$	2.35	$	1.83