Income Taxes - Narrative (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2020	Dec. 31, 2021	Dec. 31, 2019
Operating Loss Carryforwards [Line Items]
Income tax benefit, continuing operations, government grants		$ 9.5
Amortization of research and experimental expenditures	$ 18.4		$ 0.0
Valuation allowance, deferred tax asset, decrease, amount	6.0
Undistributed earnings of foreign subsidiaries	57.7
Unrecognized tax benefits	12.0	$ 9.7	10.8	$ 5.7
Unrecognized tax benefits, if recognized that would effect the effective rate	13.7		$ 11.9
Astec Brazil | Subsidiaries
Operating Loss Carryforwards [Line Items]
Valuation allowance, release	5.5
State and Local Jurisdiction
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	227.8
Foreign Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	23.8
Domestic Tax Authority
Operating Loss Carryforwards [Line Items]
Net operating loss carryforwards	$ 0.0