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Supplemental Cash Flow Information (Narrative) (Details) (USD $) In Millions, unless otherwise specified | 12 Months Ended
--- | ---
Dec. 31, 2012 | Dec. 31, 2011 | Dec. 31, 2010
Supplemental Cash Flow Elements [Abstract] |  |  |
Payments of interest and commitment fees | $ 41.5 | $ 32.9 | $ 25.1
Capitalized interest | 3.9 | 0.1 |
Tax refunds received | (0.3) | (0.1) |
Cash paid for income taxes |  |  | 2.4
Incurred liabilities for fixed and intangible asset additions | $ 14.1 | $ 2.0 | $ 2.6

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