Consolidated Statements of Comprehensive Income - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Net Earnings Including Noncontrolling Interest	$ 33.7	$ 45.9	$ 33.5
Other Comprehensive Income (Loss):
Foreign currency translation adjustments	16.4	(4.5)	(16.2)
Pension and postretirement medical benefits	(1.3)	(0.5)	1.7
Cash flow hedge	2.9	4.6	1.3
Income Taxes:
Foreign currency translation adjustments	0.8	0.1	0.2
Pension and postretirement medical benefits	0.3	0.1	(0.5)
Cash flow hedge	(0.7)	(1.1)	(1.4)
Total Other Comprehensive Income (Loss), net of tax	18.4	(1.3)	(14.9)
Total Comprehensive Income Including Noncontrolling Interest	52.1	44.6	18.6
Comprehensive Income Attributable to Noncontrolling Interest	0.0	0.1	0.1
Comprehensive Income Attributable to Tennant Company	$ 52.1	$ 44.5	$ 18.5