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Commitments and Contingencies (Tables) | 12 Months Ended
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Dec. 31, 2017
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, 2017, including those of our subsidiaries.
|  |  |  |  |  | Payments Due By Period
(in millions) |  | Date Contracts Extend Through |  | Total Amounts Committed |  | 2018 |  | 2019 |  | 2020 |  | 2021 |  | 2022 |  | Later Years
Electric utility: |  |  |  |  |  |  |  |  |  |  |  |  |  |  |  |
Nuclear |  | 2033 |  | $ | 9,184.5 |  |  | $ | 420.1 |  |  | $ | 445.4 |  |  | $ | 475.1 |  |  | $ | 501.1 |  |  | $ | 531.2 |  |  | $ | 6,811.6 |
Purchased power |  | 2027 |  | 645.3 |  |  | 109.3 |  |  | 73.5 |  |  | 72.8 |  |  | 68.9 |  |  | 62.1 |  |  | 258.7 |
Coal supply and transportation |  | 2024 |  | 341.2 |  |  | 223.3 |  |  | 72.0 |  |  | 38.8 |  |  | 2.1 |  |  | 2.1 |  |  | 2.9 |
Natural gas utility supply and transportation |  | 2043 |  | 1,469.9 |  |  | 331.5 |  | ` | 294.6 |  |  | 219.2 |  |  | 123.3 |  |  | 78.9 |  |  | 422.4 |
Total |  |  |  | $ | 11,640.9 |  |  | $ | 1,084.2 |  |  | $ | 885.5 |  |  | $ | 805.9 |  |  | $ | 695.4 |  |  | $ | 674.3 |  |  | $ | 7,495.6 |
Schedule of minimum future payments under noncancelable operating leases | Future minimum payments under noncancelable operating leases are payable as follows:
Year Ending December 31 |  | Payments (in millions)
2018 |  | $ | 9.5 |
2019 |  | 9.2 |
2020 |  | 7.6 |
2021 |  | 7.2 |
2022 |  | 7.5 |
Later years |  | 74.1 |
Total |  | $ | 115.1 |
Schedule of regulatory assets and reserves related to manufactured gas plant sites | We have established the following regulatory assets and reserves related to manufactured gas plant sites as of December 31:
(in millions) |  | 2017 |  | 2016
Regulatory assets |  | $ | 676.6 |  |  | $ | 702.7 |
Reserves for future remediation |  | 617.2 |  |  | 633.4 |

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- Definition Tabular disclosure for lessee's operating leases. Includes, but is not limited to, description of lessee's operating lease, existence and terms of renewal or purchase options and escalation clauses, restrictions imposed by lease, such as those concerning dividends, additional debt, and further leasing, rent holidays, rent concessions, or leasehold improvement incentives and unusual provisions or conditions. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41502-112717 Reference 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 55 -Paragraph 40 -Subparagraph (Note 1,3) -URI http://asc.fasb.org/extlink&oid=82846649&loc=d3e38371-112697 Reference 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 10 -Section 50 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=84164451&loc=d3e36991-112694 Reference 4: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 840 -SubTopic 20 -Section 50 -Paragraph 1 -URI http://asc.fasb.org/extlink&oid=77902758&loc=d3e41499-112717 Reference 5: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 460 -SubTopic 10 -Section 50 -Paragraph 4 -URI http://asc.fasb.org/extlink&oid=82913245&loc=d3e12069-110248 + 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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