Fair Value Measurements and Derivative Instruments (Fuel Price Risk) (Details) - Fuel Price Risk $ in Millions	Dec. 31, 2018 USD ($) T	Dec. 31, 2017 USD ($) T
Derivative instruments disclosure
Estimated unrealized net losses associated with cash flow hedges pertaining to fuel swap agreements expected to be reclassified to earnings from other accumulated comprehensive income (loss) \| $	$ 26.8	$ 23.7
2018
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	0	673,700,000
Percentage of projected requirements	0.00%	50.00%
2019
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	856,800,000	668,500,000
Percentage of projected requirements	58.00%	46.00%
2020
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	830,500,000	531,200,000
Percentage of projected requirements	54.00%	36.00%
2021
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	488,900,000	224,900,000
Percentage of projected requirements	28.00%	14.00%
2022
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	322,900,000	0
Percentage of projected requirements	19.00%	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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