Condensed Consolidated Statements of Income (Loss) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Services revenue	$ 275.7	$ 203.4	$ 522.4	$ 613.1
Cost of services	229.2	216.8	437.6	656.7
Gross profit	46.5	(13.4)	84.8	(43.6)
General and administrative expenses	22.0	22.8	43.0	43.5
Depreciation and amortization	6.2	7.9	12.5	15.4
Impairment of intangible assets		3.7		3.7
Operating income (loss)	18.3	(47.8)	29.3	(106.2)
Other expense (income)
Interest expense	5.1	5.3	10.9	9.7
Interest income	(0.1)	(0.1)	(0.2)	(0.2)
Other expenses (income)		0.2		(0.1)
Total other expenses	5.0	5.4	10.7	9.4
Earnings (loss) before income taxes	13.3	(53.2)	18.6	(115.6)
Income tax expense (benefit)	3.5	(13.4)	4.9	(30.2)
Net income (loss)	9.8	(39.8)	13.7	(85.4)
Less: Net income (loss) attributable to noncontrolling interest	0.8	(0.7)	2.4	(0.2)
Net income (loss) attributable to SP Plus Corporation	$ 9.0	$ (39.1)	$ 11.3	$ (85.2)
Net income (loss) per common share
Basic (in dollars per share)	$ 0.42	$ (1.86)	$ 0.53	$ (4.05)
Diluted (in dollars per share)	$ 0.42	$ (1.86)	$ 0.53	$ (4.05)
Weighted average shares outstanding
Basic (in shares)	21,177,142	20,972,057	21,145,494	21,062,495
Diluted (in shares)	21,390,609	20,972,057	21,347,514	21,062,495
Lease Type Contracts
Services revenue	$ 50.9	$ 30.2	$ 93.6	$ 111.9
Cost of services	39.5	43.1	74.8	123.3
Gross profit	11.4	(12.9)	18.8	(11.4)
Management Type Contracts
Services revenue	90.3	62.8	176.3	199.9
Cost of services	55.2	46.6	110.2	137.9
Gross profit	35.1	16.2	66.1	62.0
Lease and Management Type Contracts
Services revenue	141.2	93.0	269.9	311.8
Cost of services	94.7	89.7	185.0	261.2
Reimbursed Management Type Contract Revenue
Services revenue	134.5	110.4	252.5	301.3
Cost of services	$ 134.5	110.4	252.5	301.3
Lease Impairment
Cost of services		16.7	0.1	94.2
Gross profit		$ (16.7)	$ (0.1)	$ (94.2)