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Supplemental Financial Information (Narrative) (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Supplemental Financial Information [Abstract]
Increase (Decrease) in Other Operating Assets and Liabilities, Net	$ 75.8	$ (177.3)
Capitalized interest	45.7	87.4	$ 78.2
Capital expenditure accruals	$ 11.5	$ 60.9	$ 137.2

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Capital expenditure accruals.

+ References

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- Definition

Supplemental Financial Information [Abstract]

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- Definition

Amount of increase (decrease) in current operating assets after deduction of current operating liabilities classified as other.

+ References

No definition available.

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- Definition

Amount of interest capitalized during the period.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Allowance for Funds Used during Construction
-URI http://asc.fasb.org/extlink&oid=6504829

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 835
-SubTopic 20
-Section 50
-Paragraph 1
-Subparagraph (b)
-URI http://asc.fasb.org/extlink&oid=6450988&loc=d3e26243-108391

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