Condensed Consolidated Statements of Comprehensive Income (Loss) (Unaudited) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2021	Jun. 30, 2020	Jun. 30, 2021	Jun. 30, 2020
Statement of Comprehensive Income [Abstract]
Net loss	$ (5.5)	$ (17.0)	$ (0.1)	$ (15.7)
Other comprehensive income (loss), net of tax:
Currency translation	1.6	2.9	(2.7)	(13.7)
Pension and other postretirement benefits	0.2	0.4	0.4	0.9
Total other comprehensive income (loss)	1.8	3.3	(2.3)	(12.8)
Total comprehensive loss, net of tax	(3.7)	(13.7)	(2.4)	(28.5)
Comprehensive loss attributable to noncontrolling interests	0.2	0.4	0.3	0.3
Comprehensive loss attributable to Park-Ohio Holdings Corp. common shareholders	$ (3.5)	$ (13.3)	$ (2.1)	$ (28.2)