Restructuring and Other Charges, Net - Narrative (Details) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2019	Jun. 30, 2019
Restructuring and Related Activities [Abstract]
Severance costs, net	$ 13.7	$ 13.7

Severance Costs, Voluntary Retirement Incentive Program

No definition available.

Name:	st_SeveranceCostsVoluntaryRetirementIncentiveProgram
Namespace Prefix:	st_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration