Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Statement of Comprehensive Income [Abstract]
Net (loss) income	$ (4.8)	$ 39.7	$ 55.2
Other comprehensive income (loss):
Currency translation	14.1	(1.1)	(9.7)
Pensions and other postretirement benefits, net of tax	4.8	5.0	(13.3)
Total other comprehensive income (loss)	18.9	3.9	(23.0)
Total comprehensive income, net of tax	14.1	43.6	32.2
Comprehensive loss (income) attributable to noncontrolling interest	0.3	(1.1)	(1.6)
Comprehensive income attributable to ParkOhio common shareholders	$ 14.4	$ 42.5	$ 30.6