Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2016	Sep. 30, 2015	Sep. 30, 2016	Sep. 30, 2015
Parking services revenue
Lease contracts	$ 136.1	$ 146.6	$ 410.3	$ 428.9
Management contracts	84.1	85.8	262.0	268.2
Total parking services revenue	220.2	232.4	672.3	697.1
Reimbursed management contract revenue	188.9	168.3	537.0	513.4
Total revenue	409.1	400.7	1,209.3	1,210.5
Cost of parking services
Lease contracts	125.8	136.0	380.4	399.1
Management contracts	50.5	53.6	162.6	167.5
Total cost of parking services, gross	176.3	189.6	543.0	566.6
Reimbursed management contract expense	188.9	168.3	537.0	513.4
Total cost of parking services	365.2	357.9	1,080.0	1,080.0
Gross profit
Lease contracts	10.3	10.6	29.9	29.8
Management contracts	33.6	32.2	99.4	100.7
Total gross profit	43.9	42.8	129.3	130.5
General and administrative expenses	20.3	23.7	67.0	74.2
Depreciation and amortization	7.8	8.3	26.8	24.4
Operating income	15.8	10.8	35.5	31.9
Other expenses (income)
Interest expense	2.7	2.9	8.1	10.0
Interest income	(0.1)	0.0	(0.4)	(0.1)
Gain on a sale of business	0.0	(0.5)	0.0	(0.5)
Equity in losses from investment in unconsolidated entity	0.4	0.4	1.2	1.2
Total other expenses	3.0	2.8	8.9	10.6
Earnings before income taxes	12.8	8.0	26.6	21.3
Income tax expense	5.1	3.5	10.9	4.5
Net income	7.7	4.5	15.7	16.8
Less: Net income attributable to noncontrolling interest	0.7	0.8	2.2	2.0
Net income attributable to SP Plus Corporation	$ 7.0	$ 3.7	$ 13.5	$ 14.8
Net income per share
Basic (in dollars per share)	$ 0.31	$ 0.17	$ 0.60	$ 0.67
Diluted (in dollars per share)	$ 0.31	$ 0.16	$ 0.60	$ 0.66
Weighted average shares outstanding
Basic (in shares)	22,208,139	22,205,707	22,293,776	22,159,701
Diluted (in shares)	22,497,111	22,548,166	22,571,933	22,519,818