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Net Income per Common Share (Tables)
 6 Months Ended
Jun. 30, 2016
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
 
Six Months Ended
(millions, except for share and per share data) (unaudited)
June 30, 2016
 
June 30, 2015
 
June 30, 2016
 
June 30, 2015
Net income attributable to SP Plus Corporation
$
6.5

 
$
9.8

 
$
6.5

 
$
11.1

Basic weighted average common shares outstanding
22,344,898

 
22,145,190

 
22,336,693

 
22,136,458

Dilutive impact of share-based awards
280,573

 
376,642

 
272,750

 
368,945

Diluted weighted average common shares outstanding
22,625,471

 
22,521,832

 
22,609,443

 
22,505,403

Net income per common share
 

 
 

 
 
 
 
Basic
$
0.29

 
$
0.44

 
$
0.29

 
$
0.50

Diluted
$
0.29

 
$
0.43

 
$
0.29

 
$
0.49