Fair Value Measurements and Derivative Instruments (Fuel Price Risk) (Details) - Fuel Price Risk $ in Millions	12 Months Ended
Dec. 31, 2020 USD ($) T t	Dec. 31, 2019 T t
Derivative instruments disclosure
Discontinued cash flow hedge, nonmonetary amount	600,000
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) \| $	$ 13.1
Other income (expense)
Derivative instruments disclosure
Discontinued cash flow hedge, reclassification loss \| $	$ 104.4
2021
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	385,050,000	488,900,000
Percentage of projected requirements	40.00%	30.00%
2021 \| Not Designated as Hedging Instrument
Derivative instruments disclosure
Fuel Swap Agreements (metric tons) \| t	229,850,000	0
2022
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	389,650,000	322,900,000
Percentage of projected requirements	23.00%	19.00%
2022 \| Not Designated as Hedging Instrument
Derivative instruments disclosure
Fuel Swap Agreements (metric tons) \| t	14,650,000	0
2023
Derivative instruments disclosure
Fuel Swap Agreements (metric tons)	82,400,000	82,400,000
Percentage of projected requirements	5.00%	5.00%

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Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 815
-SubTopic 10
-Section 50
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Amount, before tax, of reclassification from accumulated other comprehensive income (AOCI) for gain (loss) from discontinuance of cash flow hedge included in assessment of hedge effectiveness.

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-Publisher FASB
-Name Accounting Standards Codification
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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.

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