Document Description File Type Size iosp-20231231.xsd XBRL Taxonomy Extension Schema EX-101.SCH 5 KB iosp-20231231_def.xml XBRL Taxonomy Extension Definition Linkbase EX-101.DEF 8 KB iosp-20231231_lab.xml XBRL Taxonomy Extension Label Linkbase EX-101.LAB 59 KB iosp-20231231_pre.xml XBRL Taxonomy Extension Presentation Linkbase EX-101.PRE 43 KB innospec-def14a_051024_htm.xml XML 136 KB