Fair Value Measurements and Derivative Instruments (Fuel Price Risk) (Details) - Fuel Price Risk $ in Millions	Dec. 31, 2016 USD ($) T	Dec. 31, 2015 USD ($) T
Derivative instruments disclosure
Estimated unrealized net gains associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from other accumulated comprehensive income (loss) \| $	$ (138.5)	$ (321.0)
2016
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	0	930,000
Percentage of projected requirements	0.00%	65.00%
2017
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	799,065	854,000
Percentage of projected requirements	60.00%	59.00%
2018
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	616,300	583,000
Percentage of projected requirements	44.00%	40.00%
2019
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	521,000	231,000
Percentage of projected requirements	35.00%	15.00%
2020
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	306,500	0
Percentage of projected requirements	20.00%	0.00%

Aggregate notional amount of derivative expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract.

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher SEC
-Name Regulation S-X (SX)
-Number 210
-Article 12
-Section 13
-Sentence Column B

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The percentage of expected requirements covered by the aggregate notional amount of derivative contracts expressed in nonmonetary units. For example, the number of barrels specified in a fuel oil forward purchase contract as a percentage of expected need.

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The estimated net amount of unrealized gains or losses on price risk cash flow hedges as of the balance sheet date expected to be reclassified to earnings within the next twelve months.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=35736893&loc=d3e80748-113994

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