Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Services revenue	$ 246.7	$ 409.7
Cost of services	208.4	439.9
Gross profit	38.3	(30.2)
General and administrative expenses	21.0	20.7
Depreciation and amortization	6.3	7.5
Operating income (loss)	11.0	(58.4)
Other expense (income)
Interest expense	5.8	4.4
Interest income	(0.1)	(0.1)
Gain on sale of other investments	0.0	(0.3)
Total other expenses	5.7	4.0
Earnings (loss) before income taxes	5.3	(62.4)
Income tax expense (benefit)	1.4	(16.8)
Net income (loss)	3.9	(45.6)
Less: Net income attributable to noncontrolling interest	1.6	0.5
Net income (loss) attributable to SP Plus Corporation	$ 2.3	$ (46.1)
Net income (loss) per common share
Basic (in dollars per share)	$ 0.11	$ (2.18)
Diluted (in dollars per share)	$ 0.11	$ (2.18)
Weighted average shares outstanding
Basic (in shares)	21,113,494	21,154,047
Diluted (in shares)	21,304,068	21,154,047
Lease Type Contracts
Services revenue	$ 42.7	$ 81.7
Cost of services	35.3	80.2
Gross profit	7.4	1.5
Management Type Contracts
Services revenue	86.0	137.1
Cost of services	55.0	91.3
Gross profit	31.0	45.8
Lease and Management Type Contracts
Services revenue	128.7	218.8
Cost of services	90.3	171.5
Reimbursed Management Type Contract Revenue
Services revenue	118.0	190.9
Cost of services	118.0	190.9
Lease Impairment
Cost of services	0.1	77.5
Gross profit	$ (0.1)	$ (77.5)