Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2017	Jun. 30, 2016	Jun. 30, 2017	Jun. 30, 2016
Statement of Comprehensive Income [Abstract]
Net income	$ 3.2	$ 9.0	$ 13.3	$ 11.7
Other comprehensive income (loss):
Foreign currency translation adjustment	7.5	(6.5)	11.5	(3.9)
Pension and other postretirement benefit adjustments, net of tax	0.2	0.2	0.4	0.4
Total other comprehensive income (loss)	7.7	(6.3)	11.9	(3.5)
Total comprehensive income, net of tax	10.9	2.7	25.2	8.2
Comprehensive income attributable to noncontrolling interests	(0.2)	0.0	(0.5)	0.0
Comprehensive income attributable to Park-Ohio Holdings Corp. common shareholders	$ 10.7	$ 2.7	$ 24.7	$ 8.2