Fair Value Measurements and Derivative Instruments - Fuel Price Risk (Details) - Fuel Swap Agreements $ in Millions	Jun. 30, 2018 USD ($) T	Dec. 31, 2017 USD ($) T
Derivative Instruments
Estimated unrealized net loss associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from accumulated other comprehensive income loss \| $	$ 53.0	$ (23.7)
2018
Derivative Instruments
Fuel swap agreements (metric tons)	342,900	673,700
Percentage of projected requirements	50.00%	50.00%
2019
Derivative Instruments
Fuel swap agreements (metric tons)	668,500	668,500
Percentage of projected requirements	47.00%	46.00%
2020
Derivative Instruments
Fuel swap agreements (metric tons)	531,200	531,200
Percentage of projected requirements	36.00%	36.00%
2021
Derivative Instruments
Fuel swap agreements (metric tons)	224,900	224,900
Percentage of projected requirements	14.00%	14.00%
2022
Derivative Instruments
Fuel swap agreements (metric tons)	0	0
Percentage of projected requirements	0.00%	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://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 30
-Section 50
-Paragraph 1
-Subparagraph (c)
-URI http://asc.fasb.org/extlink&oid=112277219&loc=d3e80748-113994

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