Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2019	Jun. 30, 2018	Jun. 30, 2019	Jun. 30, 2018
Services revenue	$ 414.2	$ 362.2	$ 823.6	$ 729.0
Cost of services	352.3	311.1	708.5	638.4
Gross profit	61.9	51.1	115.1	90.6
General and administrative expenses	27.7	22.3	54.8	44.6
Depreciation and amortization	7.3	4.5	14.5	8.5
Operating income	26.9	24.3	45.8	37.5
Other expenses (income)
Interest expense	4.9	2.2	9.9	4.3
Interest income	(0.1)	(0.1)	(0.2)	(0.2)
Equity in earnings from investment in unconsolidated entity	0.0	0.0	0.0	(10.0)
Total other expenses (income)	4.8	2.1	9.7	(5.9)
Earnings before income taxes	22.1	22.2	36.1	43.4
Income tax expense	5.8	6.0	8.9	11.3
Net income	16.3	16.2	27.2	32.1
Less: Net income attributable to noncontrolling interest	1.1	0.9	1.4	1.5
Net income attributable to SP Plus Corporation	$ 15.2	$ 15.3	$ 25.8	$ 30.6
Net income per common share
Basic (in dollars per share)	$ 0.68	$ 0.68	$ 1.15	$ 1.37
Diluted (in dollars per share)	$ 0.68	$ 0.68	$ 1.14	$ 1.36
Weighted average shares outstanding
Basic (in shares)	22,382,139	22,370,923	22,445,825	22,335,835
Diluted (in shares)	22,532,213	22,644,884	22,600,107	22,597,131
Lease type contracts
Services revenue	$ 105.2	$ 107.4	$ 203.0	$ 206.9
Cost of services	91.8	94.5	181.5	189.0
Gross profit	13.4	12.9	21.5	17.9
Management type contracts
Services revenue	129.9	87.7	262.8	182.2
Cost of services	81.4	49.5	169.2	109.5
Gross profit	48.5	38.2	93.6	72.7
Lease and management type contracts
Services revenue	235.1	195.1	465.8	389.1
Cost of services	173.2	144.0	350.7	298.5
Reimbursed management type contract
Services revenue	179.1	167.1	357.8	339.9
Cost of services	$ 179.1	$ 167.1	$ 357.8	$ 339.9