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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2013
Sep. 30, 2012
Cash Flows from Operating Activities    
Net income $ 49.1 $ 55.6
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 13.4 [1] 8.3 [1]
Impairment of Octane Additives segment goodwill 1.0 0.9
Deferred taxes 0.9 0.9
Profit on disposal of property, plant and equipment 0 (0.1)
Repayment of promissory note in civil complaint settlement (5.0) (5.0)
Changes in working capital:    
Trade and other accounts receivable 7.2 6.3
Inventories (24.5) (7.6)
Prepaid expenses (2.2) (0.2)
Accounts payable and accrued liabilities 3.9 7.5
Excess tax benefit from stock based payment arrangements (2.9) (2.1)
Accrued income taxes (5.3) 1.0
Movement on plant closure provisions 0.6 0
Cash contributions to defined benefit pension plans (8.1) (7.0)
Non-cash expense of defined benefit pension plans 2.6 0.1
Stock option compensation 1.9 2.4
Movements on unrecognized tax benefits (0.3) (0.1)
Movements on other non-current assets and liabilities (0.5) (1.9)
Net cash provided by operating activities 31.8 59.0
Cash Flows from Investing Activities    
Capital expenditures (6.6) (5.7)
Business combinations, net of cash acquired (50.6) 0
Internally developed software and other costs (9.0) (6.4)
Proceeds on disposal of property, plant and equipment 0.1 0.2
Purchase of short-term investments (5.3) (3.3)
Sale of short-term investments 4.1 4.2
Net cash provided by/(used in) investing activities (67.3) (11.0)
Cash Flows from Financing Activities    
Net receipt/(repayment) of revolving credit facility 68.0 4.0
Refinancing costs (0.7) 0
Excess tax benefit from stock based payment arrangements 2.9 2.1
Issue of treasury stock 0.7 0.8
Repurchase of common stock (3.7) (1.4)
Net cash provided by/(used in) financing activities 67.2 5.5
Effect of foreign currency exchange rate changes on cash (0.2) (0.1)
Net change in cash and cash equivalents 31.5 53.4
Cash and cash equivalents at beginning of period 22.4 76.2
Cash and cash equivalents at end of period $ 53.9 $ 129.6
[1] Amortization of deferred finance costs of $0.3 million (2012 - $0.3 million) are included in depreciation and amortization in the cash flow statement but in interest expense in the income statement.