Accounting Policies (Details) - USD ($) $ in Millions	Mar. 31, 2016	Dec. 31, 2015
Accounting Policies [Abstract]
Deferred tax assets current reclassified as deferred tax asset noncurrent	$ 17.4	$ 17.1
Deferred tax assets current reclassified as deferred tax liability noncurrent	6.2	7.3
Debt fees from other assets reclassified as long term debt	$ 0.3	$ 0.4

Refers to the amount of deferred tax assets current reclassified as deferred tax liability noncurrent.

No definition available.

Name:	sxt_DeferredTaxAssetsCurrentReclassifiedAsDeferredTaxLiabilityNoncurrent
Namespace Prefix:	sxt_
Data Type:	xbrli:monetaryItemType
Balance Type:	credit
Period Type:	instant