Condensed Consolidated Statements of Operations (Unaudited) - USD ($) $ in Millions	3 Months Ended	6 Months Ended
Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Income Statement [Abstract]
Net sales	$ 270.6	$ 352.8	$ 558.8	$ 629.6
Cost of sales	186.7	218.4	360.3	398.1
Gross profit	83.9	134.4	198.5	231.5
Selling, general and administrative expenses	34.5	42.5	73.0	81.6
Research and technical expenses	5.4	5.0	11.6	10.1
Restructuring and other (income) charges, net	7.3	0.3	7.8	0.3
Acquisition-related costs	0.4	0.8	1.7	23.6
Other (income) expense, net	0.9	0.0	2.9	(3.7)
Interest expense, net	10.0	13.1	20.9	24.2
Income (loss) before income taxes	25.4	72.7	80.6	95.4
Provision (benefit) for income taxes	5.2	15.9	15.1	15.9
Net income (loss)	$ 20.2	$ 56.8	$ 65.5	$ 79.5
Per share data
Basic earnings (loss) per share (usd per share)	$ 0.49	$ 1.36	$ 1.58	$ 1.90
Diluted earnings (loss) per share (usd per share)	$ 0.49	$ 1.34	$ 1.57	$ 1.88

Restructuring and Other Expense (Income)

No definition available.

Name:	ngvt_RestructuringandOtherExpenseIncome
Namespace Prefix:	ngvt_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	duration

- Definition

This element represents acquisition-related costs incurred to effect a business combination which costs have been expensed during the period. Such costs include finder's fees; advisory, legal, accounting, valuation, and other professional or consulting fees; general administrative costs, including the costs of maintaining an internal acquisitions department; and may include costs of registering and issuing debt and equity securities.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 805
-SubTopic 10
-Section 25
-Paragraph 23
-URI http://asc.fasb.org/extlink&oid=116868678&loc=d3e1043-128460