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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2019
Commitments and Contingencies Disclosure [Abstract] |
Schedule of minimum future commitments related to purchase obligations | The following table shows our minimum future commitments related to these purchase obligations as of December 31, 2019, including those of our subsidiaries.
|  |  |  |  |  | Payments Due By Period
(in millions) |  | Date Contracts Extend Through |  | Total Amounts Committed |  | 2020 |  | 2021 |  | 2022 |  | 2023 |  | 2024 |  | Later Years
Electric utility: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nuclear |  | 2033 |  | $ | 8,319.0 |  |  | $ | 475.1 |  |  | $ | 501.1 |  |  | $ | 531.2 |  |  | $ | 563.0 |  |  | $ | 596.8 |  |  | $ | 5,651.8 |
Coal supply and transportation |  | 2024 |  | 983.2 |  |  | 306.9 |  |  | 255.7 |  |  | 223.4 |  |  | 196.5 |  |  | 0.7 |  |  | — |
Purchased power |  | 2051 |  | 428.3 |  |  | 88.9 |  |  | 58.5 |  |  | 51.5 |  |  | 46.5 |  |  | 43.4 |  |  | 139.5 |
Natural gas utility: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Supply and transportation |  | 2048 |  | 1,652.3 |  |  | 344.8 |  |  | 285.5 |  |  | 224.6 |  |  | 131.2 |  |  | 70.8 |  |  | 595.4 |
Non-utility energy infrastructure: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Purchased power |  | 2061 |  | 173.6 |  |  | 7.7 |  |  | 8.8 |  |  | 8.6 |  |  | 8.8 |  |  | 8.9 |  |  | 130.8 |
Natural gas storage and transportation |  | 2048 |  | 13.6 |  |  | 7.7 |  |  | 2.7 |  |  | 1.3 |  |  | 0.8 |  |  | 0.1 |  |  | 1.0 |
Total |  |  |  | $ | 11,570.0 |  |  | $ | 1,231.1 |  |  | $ | 1,112.3 |  |  | $ | 1,040.6 |  |  | $ | 946.8 |  |  | $ | 720.7 |  |  | $ | 6,518.5 |
Schedule of regulatory assets and reserves related to manufactured gas plant sites | We have established the following regulatory assets and reserves for manufactured gas plant sites as of December 31:
(in millions) |  | 2019 |  | 2018
Regulatory assets |  | $ | 685.5 |  |  | $ | 687.1 |
Reserves for future environmental remediation |  | 589.2 |  |  | 616.4 |

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- Definition Tabular disclosure of information about obligations resulting from other commitments. + References No definition available. + Details
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- Definition Tabular disclosure of unconditional purchase obligations, including the nature and significant terms of an unconditional purchase obligation; the amount of the fixed and determinable portion of the obligation as of the date of the latest balance sheet presented in the aggregate and, if determinable, for each of the five succeeding fiscal years; the amount purchased under the obligation for the reporting period. + References No definition available. + Details
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