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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
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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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