Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (7.4)	$ 5.2	$ (7.5)	$ (10.5)
Other comprehensive (loss) income, net of tax:
Currency translation	(5.5)	12.6	(8.2)	(1.1)
Pension and other postretirement benefits	0.2	0.3	0.6	1.2
Total other comprehensive (loss) income	(5.3)	12.9	(7.6)	0.1
Total comprehensive (loss) income, net of tax	(12.7)	18.1	(15.1)	(10.4)
Comprehensive loss attributable to noncontrolling interests	0.2	0.1	0.5	0.4
Comprehensive (loss) income attributable to Park-Ohio Holdings Corp. common shareholders	$ (12.5)	$ 18.2	$ (14.6)	$ (10.0)