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Supplemental Cash Flow Information (Narrative) (Details) - USD ($) $ in Millions | 6 Months Ended
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Jun. 30, 2016 | Jun. 30, 2015
Supplemental Cash Flow Elements [Abstract] |  |
Payments of interest and commitment fees | $ 78.4 | $ 40.3
Interest Paid, Capitalized | 12.3 | 7.2
Incurred liabilities for fixed and intangible asset additions | 55.6 | $ 52.9
Other Asset Additions Incurred but Not yet Paid | $ 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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