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Commitments (Details) $ in Millions | 12 Months Ended
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Dec. 31, 2022 USD ($) t | Dec. 31, 2021 USD ($) | Dec. 31, 2020 USD ($)
Long-term Purchase Commitment |  |  |
Purchases made under long-term commitments during the reporting period | $ 4,600.0 | $ 3,100.0 | $ 1,900.0
Unrecorded Unconditional Purchase Obligation, Fiscal Year Maturity |  |  |
2020 | 4,393.0 |  |
2021 | 1,054.2 |  |
2022 | 307.7 |  |
2023 | 216.3 |  |
2024 | 40.0 |  |
Subsequent years | 92.3 |  |
Total | 6,103.5 |  |
Purchases made for the fiscal period were as follows: |  |  |
Purchases made under long-term commitments during the reporting period | 4,600.0 | $ 3,100.0 | $ 1,900.0
Surety Bonds Outstanding |  |  |
Total amount of surety bonds outstanding | 724.2 |  |
Surety bonds outstanding for mining reclamation obligations | 382.3 |  |
Surety bonds outstanding for other than mining reclamation obligations | 41.1 |  |
Plant City and Bonnie Facilities [Member] |  |  |
Long-term Purchase Commitment |  |  |
Surety Bonds Outstanding Delivered To EPA | 300.8 |  |
Surety Bonds Outstanding |  |  |
Surety Bonds Outstanding Delivered To EPA | $ 300.8 |  |
Inventories At Price Tied To Natural Gas |  |  |
Long-term Purchase Commitment |  |  |
Long-term Purchase Commitment, Minimum Quantity Required | t | 545,000 |  |
Long Term Purchase Commitment Maximum Quantity Required | t | 725,000 |  |

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