Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Net income including noncontrolling interest	$ 64.9	$ 33.7	$ 45.9
Other comprehensive (loss) income:
Foreign currency translation adjustments (net of related tax benefits of $0.4, $0.8, and $0.1, respectively)	(16.9)	17.2	(4.4)
Pension and postretirement medical benefits (net of related tax benefit of $0.3, $0.3, and $0.1, respectively)	(0.4)	(1.0)	(0.4)
Cash flow hedge (net of tax benefit (expense) of $0.1, $(0.7), and $(1.1), respectively)	(0.5)	2.2	3.5
Total other comprehensive (loss) income, net of tax	(17.8)	18.4	(1.3)
Total comprehensive income including noncontrolling interest	47.1	52.1	44.6
Comprehensive income attributable to noncontrolling interest	0.0	0.0	0.1
Comprehensive income attributable to Tennant Company	$ 47.1	$ 52.1	$ 44.5