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Consolidated Statements of Cash Flows (USD $)
In Millions, unless otherwise specified
 9 Months Ended
Sep. 30, 2014
Sep. 30, 2013
Cash Flows from Operating Activities    
Net income $ 56.2 $ 49.1
Adjustments to reconcile net income to net cash provided by operating activities:    
Depreciation and amortization 21.1 [1] 13.4 [1]
Impairment of Octane Additives segment goodwill 0 1.0
Deferred taxes 1.9 0.9
Repayment of promissory note in civil complaint settlement (5.0) (5.0)
Excess tax benefit from stock-based payment arrangements (0.7) (2.9)
Cash contributions to defined benefit pension plans (8.8) (8.1)
Non-cash expense of defined benefit pension plans 3.0 2.6
Stock option compensation 1.7 1.9
Changes in assets and liabilities, net of effects of acquired and divested companies:    
Trade and other accounts receivable 17.4 7.2
Inventories (14.8) (24.5)
Prepaid expenses 2.0 (2.2)
Accounts payable and accrued liabilities (20.0) 3.9
Accrued income taxes 10.7 (5.3)
Plant closure provisions (0.7) 0.6
Unrecognized tax benefits (7.2) (0.3)
Other non-current assets and liabilities 2.2 (0.5)
Net cash provided by operating activities 59.0 31.8
Cash Flows from Investing Activities    
Capital expenditures (9.5) (6.6)
Business combinations, net of cash acquired 0.3 (50.6)
Internally developed software and other costs (6.1) (9.0)
Proceeds on disposal of property, plant and equipment 0.2 0.1
Purchase of short-term investments (4.2) (5.3)
Sale of short-term investments 5.8 4.1
Net cash provided by/(used in) investing activities (13.5) (67.3)
Cash Flows from Financing Activities    
Proceeds from revolving credit facility 8.0 86.0
Repayments of revolving credit facility (35.0) (18.0)
Repayments of term loans (0.9) 0
Refinancing costs (0.1) (0.7)
Excess tax benefit from stock-based payment arrangements 0.7 2.9
Dividend paid (6.6) 0
Issue of treasury stock 0.4 0.7
Repurchase of common stock (0.9) (3.7)
Net cash provided by/(used in) financing activities (34.4) 67.2
Effect of foreign currency exchange rate changes on cash (0.9) (0.2)
Net change in cash and cash equivalents 10.2 31.5
Cash and cash equivalents at beginning of period 80.2 22.4
Cash and cash equivalents at end of period $ 90.4 $ 53.9
[1] Amortization of deferred finance costs of $0.5 million (2013 - $0.3 million) are included in depreciation and amortization in the cash flow statement but in interest expense in the income statement.