Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2020

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, 2020, including those of our subsidiaries.

				Payments Due By Period
(in millions)	Date Contracts Extend Through	Total Amounts Committed		2021		2022		2023		2024		2025		Later Years
Electric utility:
Nuclear	2033	$	7,843.9	$	501.1	$	531.2	$	563.1	$	596.8	$	632.6	$	5,019.1
Coal supply and transportation	2024	600.1		257.8		190.6		151.0		0.7		—		—
Purchased power	2051	339.7		58.2		51.6		46.5		43.4		44.6		95.4
Natural gas utility:
Supply and transportation	2048	1,805.8		337.4		318.1		236.7		162.5		96.4		654.7
Non-utility energy infrastructure:
Purchased power	2061	380.1		18.4		18.2		18.0		18.1		18.5		288.9
Natural gas storage and transportation	2048	9.8		6.7		1.3		0.8		—		—		1.0
Total		$	10,979.4	$	1,179.6	$	1,111.0	$	1,016.1	$	821.5	$	792.1	$	6,059.1

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)	2020		2019
Regulatory assets	$	638.2	$	685.5
Reserves for future environmental remediation	532.9		589.2