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Property, Plant and Equipment, Other (Details) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)	Jun. 30, 2016 USD ($)	Jun. 30, 2015 USD ($)
Property, Plant and Equipment [Line Items]
Capital expenditures			$ 1,880.4	$ 1,638.0
Loss due to Pascagoula fire	$ 7.1	$ 0.0	7.1	$ 0.0
Insurance Matters [Abstract]
Insurance deductible per incident	$ 55.0		$ 55.0
Minimum business interruption period (in days)			60 days
Pascagoula Natural Gas Processing Facility [Member]
Property, Plant and Equipment [Line Items]
Undivided ownership interest acquired (in hundredths)			0.6
Capital expenditures			$ 35.0
Loss due to Pascagoula fire			$ 7.1

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Minimum number of days of business interruption to file an insurance claim.

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The charge against earnings in the period for the uninsured portion of a loss from a fire, explosion, or natural disaster (hurricane, earthquake).

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 225
-SubTopic 10
-Section S99
-Paragraph 2
-Subparagraph (SX 210.5-03.9)
-URI http://asc.fasb.org/extlink&oid=26872669&loc=d3e20235-122688

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The cash outflow associated with the acquisition of long-lived, physical assets that are used in the normal conduct of business to produce goods and services and not intended for resale; includes cash outflows to pay for construction of self-constructed assets.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Glossary Investing Activities
-URI http://asc.fasb.org/extlink&oid=6516133

Reference 2: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
-SubTopic 10
-Section 45
-Paragraph 13
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=56944662&loc=d3e3213-108585

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