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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2012 | Jun. 30, 2011 | Jun. 30, 2012 | Jun. 30, 2011
Supplemental disclosure of cash flow information: |  |  |  |
Interest paid |  |  | $ 5.1 | $ 5.1
Income taxes paid | 0.3 | 0.9 | 0.5 | 1.0
Supplemental disclosure of non-cash transactions: |  |  |  |
Non-cash capital expenditures |  |  | $ 2.1 | $ 0.7

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