Leases - Narrative (Details) $ in Millions	Dec. 31, 2025 USD ($)
Leases [Abstract]
Aggregate residual value at lease expiration for vehicle leases	$ 25.5

The amount of aggregate residual value at lease expiration for vehicle leases.

No definition available.

Name:	tnc_AggregateResidualValueAtLeaseExpirationForVehicleLeases
Namespace Prefix:	tnc_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant