Fair Value Measurements (Details) - Recurring basis - USD ($) $ in Millions	Dec. 31, 2016	Dec. 31, 2015
Fair Value, Inputs, Level 1
Fair value measurements
Unrealized gains on natural gas derivatives	$ 0.0
Total assets at fair value	32.0	$ 95.9
Fair Value, Inputs, Level 2
Fair value measurements
Unrealized gains on natural gas derivatives	9.0
Total assets at fair value	9.0	0.0
Unrealized losses on natural gas derivatives	(1.6)	(27.9)
Total liabilities at fair value	(1.6)	(27.9)
Total
Fair value measurements
Cash Equivalents, at Fair Value	32.0	95.9
Unrealized gains on natural gas derivatives	9.0
Total assets at fair value	41.0	95.9
Unrealized losses on natural gas derivatives	(1.6)	(27.9)
Total liabilities at fair value	$ (1.6)	$ (27.9)

Cash Equivalents, at Fair Value

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- Definition

Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 820
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=66048111&loc=d3e19207-110258

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Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

+ References

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Fair value of financial and nonfinancial obligations.

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- Definition

Fair value as of the balance sheet date of price risk derivative assets, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as assets on the balance sheet.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 825
-SubTopic 10
-Section 50
-Paragraph 10
-Subparagraph (a)
-URI http://asc.fasb.org/extlink&oid=73719730&loc=d3e13433-108611

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Fair value as of the balance sheet date of price risk derivative liabilities, which includes all such derivative instruments in hedging and nonhedging relationships that are recognized as liabilities on the balance sheet.

+ References

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