Condensed Consolidated Balance Sheets (Unaudited) - USD ($) $ in Millions	Jun. 30, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 240.2	$ 203.7
Trade and other accounts receivable (less allowances of $9.4 million and $10.3 million respectively)	300.3	359.8
Inventories (less allowances of $38.0 million and $28.1 million respectively):
Finished goods	210.9	215.7
Raw materials	102.6	84.4
Total inventories	313.5	300.1
Prepaid expenses	9.7	18.7
Prepaid income taxes	12.1	2.8
Other current assets	1.0	0.6
Total current assets	876.8	885.7
Net property, plant and equipment	271.9	268.3
Operating lease right-of-use assets	47.9	45.1
Goodwill	388.2	399.3
Other intangible assets	61.4	57.3
Deferred tax assets	10.4	10.4
Pension asset	37.0	35.1
Other non-current assets	6.7	6.2
Total assets	1,700.3	1,707.4
Current liabilities:
Accounts payable	147.7	163.6
Accrued liabilities	143.1	185.9
Current portion of operating lease liabilities	14.9	13.6
Current portion of plant closure provisions	4.6	4.6
Current portion of accrued income taxes	21.3	2.6
Current portion of unrecognized tax benefits	1.2	1.2
Total current liabilities	332.8	371.5
Operating lease liabilities, net of current portion	33.2	31.6
Plant closure provisions, net of current portion	56.5	57.0
Accrued income taxes, net of current portion	0.0	11.6
Unrecognized tax benefits	10.7	13.6
Deferred tax liabilities	35.4	33.5
Pension liabilities and post-employment benefits	12.7	13.3
Acquisition-related contingent consideration	20.2	23.4
Other non-current liabilities	2.9	2.3
Total liabilities	504.4	557.8
Equity:
Common stock, $0.01 par value, authorized 40,000,000 shares, issued 29,554,500 shares	0.3	0.3
Additional paid-in capital	364.5	361.0
Treasury stock (4,613,079 and 4,686,511 shares at cost, respectively)	(93.4)	(94.3)
Retained earnings	1,081.8	1,028.2
Accumulated other comprehensive loss	(160.6)	(148.1)
Total Innospec stockholders' equity	1,192.6	1,147.1
Non-controlling interest	3.3	2.5
Total equity	1,195.9	1,149.6
Total liabilities and equity	$ 1,700.3	$ 1,707.4

Prepaid Expense Current Excluding Tax

No definition available.

Name:	iosp_PrepaidExpenseCurrentExcludingTax
Namespace Prefix:	iosp_
Data Type:	xbrli:monetaryItemType
Balance Type:	debit
Period Type:	instant

- Definition

Carrying value as of the balance sheet date of liabilities incurred (and for which invoices have typically been received) and payable to vendors for goods and services received that are used in an entity's business. Used to reflect the current portion of the liabilities (due within one year or within the normal operating cycle if longer).