CONSOLIDATED STATEMENTS OF INCOME - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2015	Dec. 31, 2014	Dec. 31, 2013
Parking services revenue
Lease contracts	$ 570.9	$ 496.6	$ 489.6
Management contracts	350.3	338.3	347.3
Total parking services revenue	921.2	834.9	836.9
Reimbursed management contract revenue	694.7	679.8	629.9
Total revenue	1,615.9	1,514.7	1,466.8
Cost of parking services
Lease contracts	532.8	455.7	456.1
Management contracts	218.3	207.9	208.7
Total cost of parking services, gross	751.1	663.6	664.8
Reimbursed management contract expense	694.7	679.8	629.9
Total cost of parking services	1,445.8	1,343.4	1,294.7
Gross profit
Lease contracts	38.1	40.9	33.5
Management contracts	132.0	130.4	138.6
Total gross profit	170.1	171.3	172.1
General and administrative expenses	97.3	101.5	98.9
Depreciation and amortization	34.0	30.3	31.2
Operating income	38.8	39.5	42.0
Other expense (income)
Interest expense	12.7	17.8	19.0
Interest income	(0.2)	(0.4)	(0.6)
Gain on sale of a business	(0.5)	0.0	0.0
Gain on contribution of a business to an unconsolidated entity	0.0	(4.1)	0.0
Equity in losses from investment in unconsolidated entity	1.7	0.3	0.0
Total other expenses (income)	13.7	13.6	18.4
Earnings before income taxes	25.1	25.9	23.6
Income tax expense (benefit)	4.8	(0.2)	8.8
Net income	20.3	26.1	14.8
Less: Net income attributable to noncontrolling interest	2.9	3.0	2.7
Net income attributable to SP Plus Corporation	$ 17.4	$ 23.1	$ 12.1
Net income per common share
Basic (in dollars per share)	$ 0.78	$ 1.05	$ 0.55
Diluted (in dollars per share)	$ 0.77	$ 1.03	$ 0.54
Weighted average shares outstanding
Basic (in shares)	22,189,140	22,009,800	21,902,870
Diluted (in shares)	22,511,759	22,407,343	22,249,584