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Supplemental Cash Flow Information (Details) (USD $)
In Millions, unless otherwise specified
3 Months Ended
Mar. 31, 2013
Mar. 31, 2012
Supplemental Cash Flow Information    
Interest paid $ 0.3 $ 0.1
Income taxes paid 2.1 0.8
Increase (decrease) in accounts payable and accrued liabilities for changes in unpaid capital expenditures $ 0.1 $ (0.6)