Condensed Consolidated Statements of Income - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2023	Mar. 31, 2022
Services revenue	$ 425.3	$ 349.8
Cost of services (exclusive of depreciation and amortization)	367.0	298.4
General and administrative expenses	30.6	24.5
Depreciation and amortization	8.4	6.8
Operating income	19.3	20.1
Other expense (income)
Interest expense	6.8	4.8
Interest income	(0.1)	(0.2)
Total other expenses	6.7	4.6
Earnings before income taxes	12.6	15.5
Income tax expense	3.3	4.2
Net income	9.3	11.3
Less: Net income attributable to noncontrolling interest	0.9	0.6
Net income attributable to SP Plus Corporation	$ 8.4	$ 10.7
Net income per common share
Basic (in dollars per share)	$ 0.43	$ 0.50
Diluted (in dollars per share)	$ 0.42	$ 0.50
Weighted average shares outstanding
Basic (in shares)	19,701,426	21,226,952
Diluted (in shares)	19,867,300	21,338,299
Lease and Management Type Contracts
Services revenue	$ 216.3	$ 184.4
Cost of services (exclusive of depreciation and amortization)	158.0	133.0
Lease Type Contracts
Services revenue	68.2	62.6
Cost of services (exclusive of depreciation and amortization)	55.2	52.0
Management Type Contracts
Services revenue	148.1	121.8
Cost of services (exclusive of depreciation and amortization)	102.8	81.0
Reimbursed Management Type Contract Revenue
Services revenue	209.0	165.4
Cost of services (exclusive of depreciation and amortization)	$ 209.0	$ 165.4