Net Income per Common Share (Tables)

3 Months Ended

Mar. 31, 2019

Earnings Per Share [Abstract]

Schedule of Reconciliation of Weighted Average Shares

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

	Three Months Ended
(millions, except share and per share data) (unaudited)	March 31, 2019		March 31, 2018
Net income attributable to SP Plus Corporation	$	10.6	$	15.3
Basic weighted average common shares outstanding	22,509,050		22,308,694
Dilutive impact of share-based awards	158,489		248,632
Diluted weighted average common shares outstanding	22,667,539		22,557,326
Net income per common share
Basic	$	0.47	$	0.69
Diluted	$	0.47	$	0.68