Consolidated Balance Sheets - USD ($) $ in Millions	Dec. 31, 2024	Dec. 31, 2023
Current assets:
Cash and cash equivalents	$ 289.2	$ 203.7
Trade and other accounts receivable (less allowances of $11.9 million and $10.3 million, respectively)	341.7	359.8
Inventories (less allowances of $34.6 million and $28.1 million, respectively):
Finished goods	197.9	215.7
Raw materials	103.1	84.4
Total inventories	301.0	300.1
Prepaid expenses	21.0	18.7
Prepaid income taxes	3.1	2.8
Other current assets	0.6	0.6
Total current assets	956.6	885.7
Net property, plant and equipment	269.7	268.3
Operating leases right-of-use assets	44.8	45.1
Goodwill	382.5	399.3
Other intangible assets	65.4	57.3
Deferred tax assets	9.4	10.4
Pension asset	2.4	35.1
Other non-current assets	3.9	6.2
Total assets	1,734.7	1,707.4
Current liabilities:
Accounts payable	163.8	163.6
Accrued liabilities	169.1	185.9
Current portion of operating lease liabilities	13.9	13.6
Current portion of plant closure provisions	5.0	4.6
Current portion of accrued income taxes	19.6	2.6
Current portion of Unrecognized tax benefits	0.0	1.2
Total current liabilities	371.4	371.5
Operating lease liabilities, net of current portion	31.0	31.6
Plant closure provisions, net of current portion	55.3	57.0
Accrued income taxes, net of current portion	0.0	11.6
Unrecognized tax benefits, net of current portion	0.0	13.6
Deferred tax liabilities	23.5	33.5
Pension liabilities and post-employment benefits	13.1	13.3
Acquisition-related contingent deferred consideration	20.1	23.4
Other non-current liabilities	4.2	2.3
Total liabilities	518.6	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	369.9	361.0
Treasury stock (4,594,943 and 4,686,511 shares at cost, respectively)	(93.0)	(94.3)
Retained earnings	1,025.0	1,028.2
Accumulated other comprehensive loss	(91.0)	(148.1)
Total Innospec stockholders' equity	1,211.2	1,147.1
Non-controlling interest	4.9	2.5
Total equity	1,216.1	1,149.6
Total liabilities and equity	$ 1,734.7	$ 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).