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Commitments and Contingencies - Unconditional Purchase Obligations (Details) $ in Millions | Dec. 31, 2018 USD ($)
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Minimum future commitments for purchase obligations |
Total Amounts Committed | $ 12,002.8
2019 | 1,211.9
2020 | 1,025.9
2021 | 900.8
2022 | 883.3
2023 | 871.9
Later Years | 7,109.0
Nuclear | Electric |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 8,764.4
2019 | 445.4
2020 | 475.1
2021 | 501.1
2022 | 531.2
2023 | 563.0
Later Years | 6,248.6
Purchased power | Electric |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 494.0
2019 | 92.8
2020 | 62.6
2021 | 58.4
2022 | 51.5
2023 | 46.6
Later Years | 182.1
Coal supply and transportation | Electric |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 1,123.8
2019 | 348.6
2020 | 228.5
2021 | 177.8
2022 | 182.4
2023 | 185.8
Later Years | 0.7
Natural gas utility supply and transportation | Natural gas |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 1,564.7
2019 | 324.1
2020 | 258.3
2021 | 162.1
2022 | 116.7
2023 | 75.0
Later Years | 628.5
Non-Utility Energy Infrastructure | Purchased power | Electric |
Minimum future commitments for purchase obligations |
Total Amounts Committed | 55.9
2019 | 1.0
2020 | 1.4
2021 | 1.4
2022 | 1.5
2023 | 1.5
Later Years | $ 49.1

X
- Definition Minimum amount of purchase arrangement in which the entity has agreed to expend funds to procure goods or services from a supplier. + References No definition available. + Details
Name: | us-gaap_PurchaseObligation
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing after the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueAfterFifthYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the fifth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the fourth fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the next fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the second fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- Definition Minimum amount of purchase arrangement maturing in the third fiscal year following the latest fiscal year. Includes, but not limited to, recorded and unrecorded purchase obligations, long-term purchase commitments, and short-term purchase commitments. + References No definition available. + Details
Name: | us-gaap_PurchaseObligationDueInThirdYear
Namespace Prefix: | us-gaap_
Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | instant

X
- References No definition available. + Details
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Namespace Prefix: | us-gaap_
Data Type: | xbrli:stringItemType
Balance Type: | na
Period Type: | duration

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- Details
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Namespace Prefix: |
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Balance Type: |
Period Type: |

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- Details
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- Details
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