Net Income per Common Share (Tables)

3 Months Ended

Mar. 31, 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
(millions, except share and per share data) (unaudited)	March 31, 2017		March 31, 2016
Net income attributable to SP Plus Corporation	$	6.0	$	—
Basic weighted average common shares outstanding	22,148,265		22,328,578
Dilutive impact of share-based awards	299,639		264,927
Diluted weighted average common shares outstanding	22,447,904		22,593,505
Net income per common share
Basic	$	0.27	$	—
Diluted	$	0.27	$	—