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Net (Loss) Income per Common Share - Basic and Diluted Net (Loss) Income per Common Share and Weighted Average Common Shares Outstanding (Details) - USD ($)
$ / shares in Units, $ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2020
Jun. 30, 2019
Jun. 30, 2020
Jun. 30, 2019
Earnings Per Share [Abstract]        
Net (loss) income attributable to SP Plus Corporation $ (39.1) $ 15.2 $ (85.2) $ 25.8
Basic weighted average common shares outstanding 20,972,057 22,382,139 21,062,495 22,445,825
Dilutive impact of share-based awards 0 150,074 0 154,282
Diluted weighted average common shares outstanding 20,972,057 22,532,213 21,062,495 22,600,107
Net (loss) income per common share        
Basic $ (1.86) $ 0.68 $ (4.05) $ 1.15
Diluted $ (1.86) $ 0.68 $ (4.05) $ 1.14