Consolidated Statements of Cash Flows (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013		Jun. 30, 2012
Cash Flows from Operating Activities
Net income	$ 35.1		$ 40.1
Adjustments to reconcile net income to net cash provided by operating activities:
Depreciation and amortization	8.8	[1]	5.5	[1]
Impairment of Octane Additives segment goodwill	0.6		0.6
Deferred taxes	0.7		0.8
Changes in working capital:
Trade and other accounts receivable	27.4		3.8
Inventories	(12.5)		(4.2)
Prepaid expenses	1.8		0.5
Accounts payable and accrued liabilities	(13.8)		(13.0)
Excess tax benefit from stock based payment arrangements	(2.0)		(1.7)
Accrued income taxes	(5.8)		2.0
Movement on plant closure provisions	0.3		(0.2)
Cash contributions to defined benefit pension plans	(5.4)		(4.7)
Non-cash expense of defined benefit pension plans	1.7		0.1
Stock option compensation	1.4		1.6
Movements on unrecognized tax benefits	(0.4)		0.1
Movements on other non-current assets and liabilities	(0.3)		(1.0)
Net cash provided by operating activities	37.6		30.3
Cash Flows from Investing Activities
Capital expenditures	(4.9)		(3.4)
Business combinations, net of cash acquired	0.6		0
Internally developed software and other costs	(3.8)		(3.5)
Purchase of short-term investments	(3.0)		(1.8)
Sale of short-term investments	3.5		1.9
Net cash provided by/(used in) investing activities	(7.6)		(6.8)
Cash Flows from Financing Activities
Net receipt/(repayment) of revolving credit facility	3.0		5.0
Excess tax benefit from stock based payment arrangements	2.0		1.7
Issue of treasury stock	0.7		0.7
Repurchase of common stock	(3.1)		(1.3)
Net cash provided by/(used in) financing activities	2.6		6.1
Effect of foreign currency exchange rate changes on cash	(0.3)		0
Net change in cash and cash equivalents	32.3		29.6
Cash and cash equivalents at beginning of period	22.4		76.2
Cash and cash equivalents at end of period	$ 54.7		$ 105.8

[1] Amortization of deferred finance costs of $0.2 million (2012-$0.2 million) are included in depreciation and amortization in the cash flow statement but in interest expense in the income statement.