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Supplemental Cash Flow Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2012 | Mar. 31, 2011
Supplemental Cash Flow Information [Abstract] |  |
Payments of interest and commitment fees | $ 5.2 | $ 3.1
Incurred liabilities for fixed and intangible asset additions | $ 4.1 | $ 0.6

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