Condensed Consolidated Statements of Comprehensive Income (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Statement of Comprehensive Income [Abstract]
Net income	$ 15.2	$ 3.3	$ 25.6	$ 13.4
Other comprehensive (loss) income, net of tax:
Currency translation	(10.3)	7.5	(6.2)	11.5
Pension and other postretirement benefit adjustments	0.0	0.2	1.4	0.4
Total other comprehensive (loss) income	(10.3)	7.7	(4.8)	11.9
Total comprehensive income, net of tax	4.9	11.0	20.8	25.3
Comprehensive income attributable to noncontrolling interests	(0.2)	(0.2)	(0.6)	(0.5)
Comprehensive income attributable to Park-Ohio Industries Inc. common shareholder	$ 4.7	$ 10.8	$ 20.2	$ 24.8