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Supplemental Cash Flow Information (Details) (USD $) In Millions, unless otherwise specified	6 Months Ended
	Jun. 30, 2013	Jun. 30, 2012
Supplemental Cash Flow Information
Interest paid	$ 0.5	$ 0.5
Income taxes paid	5.5	5.8
Increase (decrease) in accounts payable and accrued liabilities for changes in unpaid capital expenditures	$ (0.9)	$ 0.4

The amount of cash paid during the current period to foreign, federal, state, and local authorities as taxes on income, net of any cash received during the current period as refunds for the overpayment of taxes.

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