Condensed Consolidated Statements of Comprehensive (Loss) Income (unaudited) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2016	Mar. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 0.6	$ 1.8
Other Comprehensive Income (Loss), Net of Tax	(0.1)	(0.5)
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