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Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2014 | Dec. 31, 2013 | Dec. 31, 2012
Supplemental Cash Flow Elements [Abstract] |  |  |
Payments of interest and commitment fees | $ 74.8 | $ 49.7 | $ 41.5
Capitalized interest | 13.8 | 13.3 | 3.9
Cash paid for income taxes | 0.8 | (0.6) | (0.3)
Incurred liabilities for fixed and intangible asset additions | 61.2 | 52.5 | $ 14.1
Other Asset Additions Incurred but Not yet Paid | $ 9.4 | $ 0.1 |

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- Definition Future cash outflow to pay for purchases of fixed assets that have occurred. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 5 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4332-108586 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4313-108586 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 230 -SubTopic 10 -Section 50 -Paragraph 3 -URI http://asc.fasb.org/extlink&oid=6367179&loc=d3e4304-108586 + Details
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