Consolidated Statements of Comprehensive Income (Loss) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Statement of Comprehensive Income [Abstract]
Net income	$ 29.5	$ 32.2	$ 48.7
Other comprehensive income (loss):
Foreign currency translation adjustments	19.2	(13.9)	(11.8)
Pension and postretirement benefit adjustments, net of tax	5.6	1.2	(4.2)
Total other comprehensive income (loss)	24.8	(12.7)	(16.0)
Total comprehensive income, net of tax	54.3	19.5	32.7
Comprehensive income attributable to noncontrolling interest	(0.9)	(0.5)	(0.6)
Comprehensive income attributable to ParkOhio common shareholders	$ 53.4	$ 19.0	$ 32.1