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Commitments and Contingencies (Tables)

12 Months Ended

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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Tabular disclosure of information about obligations resulting from other commitments.

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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.

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