Comprehensive (Loss) Income - Components of Comprehensive Income (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Comprehensive Income (Loss), Net of Tax, Attributable to Parent [Abstract]
Net income	$ 0.6	$ 1.8
Effective portion of unrealized loss on cash flow hedge	(0.2)	(0.3)
Foreign currency translation	0.1	(0.2)
Comprehensive income	0.5	1.3
Less: Comprehensive income attributable to noncontrolling interest	0.6	0.5
Comprehensive (loss) income attributable to SP Plus Corporation	$ (0.1)	$ 0.8