Fair Value Measurements and Derivative Instruments (Fuel Price Risk) (Details) - Fuel Price Risk $ in Millions	Dec. 31, 2019 USD ($) T	Dec. 31, 2018 USD ($) 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) \| $	$ 0.0	$ 26.8
2019
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	0	856,800,000
Percentage of projected requirements	0.00%	58.00%
2020
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	830,500,000	830,500,000
Percentage of projected requirements	54.00%	54.00%
2021
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	488,900,000	488,900,000
Percentage of projected requirements	30.00%	28.00%
2022
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	322,900,000	322,900,000
Percentage of projected requirements	19.00%	19.00%
2023
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	82,400,000	0
Percentage of projected requirements	5.00%	0.00%

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Nominal number of units used to calculate payment on derivative.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1B
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5580258-113959

Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
-Paragraph 1A
-Subparagraph (d)
-URI http://asc.fasb.org/extlink&oid=109980867&loc=SL5579245-113959

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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
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