Net (Loss) Income per Common Share (Tables)

12 Months Ended

Dec. 31, 2020

Earnings Per Share [Abstract]

Schedule of Basic and Diluted Net (Loss) Income per Common Share and Reconciliation of Weighted Average Shares

Basic and diluted net (loss) income per common share and a reconciliation the weighted average basic common shares outstanding to the weighted average diluted common shares outstanding was as follows:

	Year Ended December 31,
(millions, except share and per share data)	2020			2019		2018
Net (loss) income attributable to SP Plus Corporation	$	(172.8	)	$	48.8	$	53.2
Basic weighted average common shares outstanding		21,056,061			22,080,025		22,394,542
Dilutive impact of share-based awards		—			128,007		212,681
Diluted weighted average common shares outstanding		21,056,061			22,208,032		22,607,223
Net (loss) income per common share
Basic	$	(8.21	)	$	2.21	$	2.38
Diluted	$	(8.21	)	$	2.20	$	2.35