Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2019	Sep. 30, 2018	Sep. 30, 2019	Sep. 30, 2018
Services revenue	$ 418.6	$ 362.1	$ 1,242.2	$ 1,091.2
Cost of services	359.9	317.1	1,068.4	955.6
Gross profit	58.7	45.0	173.8	135.6
General and administrative expenses	26.0	18.7	80.8	63.3
Depreciation and amortization	7.3	4.2	21.8	12.7
Operating income	25.4	22.1	71.2	59.6
Other expenses (income)
Interest expense	4.8	2.1	14.7	6.5
Interest income	(0.1)	(0.1)	(0.3)	(0.3)
Equity in earnings from investment in unconsolidated entity	0.0	0.0	0.0	(10.1)
Total other expenses (income)	4.7	2.0	14.4	(3.9)
Earnings before income taxes	20.7	20.1	56.8	63.5
Income tax expense	5.7	5.6	14.6	16.9
Net income	15.0	14.5	42.2	46.6
Less: Net income attributable to noncontrolling interest	0.8	1.0	2.2	2.5
Net income attributable to SP Plus Corporation	$ 14.2	$ 13.5	$ 40.0	$ 44.1
Net income per common share
Basic (in dollars per share)	$ 0.64	$ 0.60	$ 1.79	$ 1.97
Diluted (in dollars per share)	$ 0.64	$ 0.60	$ 1.78	$ 1.95
Weighted average shares outstanding
Basic (in shares)	21,945,129	22,439,884	22,277,852	22,370,789
Diluted (in shares)	22,038,905	22,626,746	22,411,965	22,607,274
Lease type contracts
Services revenue	$ 104.6	$ 104.7	$ 307.6	$ 311.6
Cost of services	93.0	94.2	274.5	283.2
Gross profit	11.6	10.5	33.1	28.4
Management type contracts
Services revenue	132.6	82.6	395.4	264.8
Cost of services	85.5	48.1	254.7	157.6
Gross profit	47.1	34.5	140.7	107.2
Lease and management type contracts
Services revenue	237.2	187.3	703.0	576.4
Cost of services	178.5	142.3	529.2	440.8
Reimbursed management type contract revenue
Services revenue	181.4	174.8	539.2	514.8
Cost of services	$ 181.4	$ 174.8	$ 539.2	$ 514.8