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CONSOLIDATED STATEMENTS OF COMPREHENSIVE INCOME - USD ($)
$ in Millions
 3 Months Ended 6 Months Ended
Jun. 30, 2025
Jun. 30, 2024
Jun. 30, 2025
Jun. 30, 2024
Statement of Comprehensive Income [Abstract]        
Net income $ 20.2 $ 27.9 $ 33.3 $ 56.3
Other comprehensive income (loss):        
Foreign currency translation adjustments (net of related tax benefit (expense) of $1.7, $0.1, $1.9 and $(0.1), respectively) 23.8 (7.1) 39.3 (15.3)
Pension and postretirement medical benefits (net of related tax expense of $0.0, $0.0, $0.0 and $0.0, respectively) 0.1 0.0 0.0 0.0
Derivative financial instruments (net of related tax benefit of $0.1, $0.1, $0.1 and $0.4, respectively) (0.1) 0.3 (0.2) 1.3
Total other comprehensive income (loss), net of tax 23.8 (6.8) 39.1 (14.0)
Total comprehensive income including noncontrolling interest 44.0 21.1 72.4 42.3
Foreign currency translation adjustments attributable to noncontrolling interest 0.1 0.0 0.5 0.0
Comprehensive income attributable to Tennant Company $ 43.9 $ 21.1 $ 71.9 $ 42.3