Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2017	Sep. 30, 2016	Sep. 30, 2017	Sep. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 10.2	$ 13.8	$ 23.5	$ 25.5
Other comprehensive income (loss):
Foreign currency translation adjustment	7.5	(1.3)	18.9	(5.3)
Pension and other postretirement benefit adjustments, net of tax	0.2	0.3	0.6	0.7
Total other comprehensive income (loss)	7.7	(1.0)	19.5	(4.6)
Total comprehensive income, net of tax	17.9	12.8	43.0	20.9
Comprehensive income attributable to noncontrolling interests	(0.2)	(0.3)	(0.7)	(0.3)
Comprehensive income attributable to Park-Ohio Holdings Corp. common shareholders	$ 17.7	$ 12.5	$ 42.3	$ 20.6