Net Income per Common Share (Tables)

12 Months Ended

Dec. 31, 2023

Earnings Per Share [Abstract]

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

Basic and diluted net income per common share and a reconciliation of the weighted average basic common shares outstanding to the weighted average diluted common shares outstanding during the years ending December 31, 2023, 2022 and 2021 was as follows:

	Year Ended December 31,
(millions, except share and per share data)	2023		2022		2021
Net income attributable to SP Plus Corporation	$	31.1	$	45.2	$	31.7
Basic weighted average common shares outstanding		19,670,918		20,809,363		21,166,323
Dilutive impact of share-based awards		110,470		197,705		213,660
Diluted weighted average common shares outstanding		19,781,388		21,007,068		21,379,983
Net income per common share
Basic	$	1.58	$	2.17	$	1.50
Diluted	$	1.57	$	2.15	$	1.48

There were no additional securities that could dilute basic earnings per share in the future that were not included in the computation of diluted net income per common share, other than those disclosed.