Commitments and Contingencies (Tables)

12 Months Ended

Dec. 31, 2018

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, 2018, including those of our subsidiaries.

				Payments Due By Period
(in millions)	Date Contracts Extend Through	Total Amounts Committed		2019		2020		2021		2022		2023		Later Years
Electric utility:
Nuclear	2033	$	8,764.4	$	445.4	$	475.1	$	501.1	$	531.2	$	563.0	$	6,248.6
Purchased power	2043	494.0		92.8		62.6		58.4		51.5		46.6		182.1
Coal supply and transportation	2024	1,123.8		348.6		228.5		177.8		182.4		185.8		0.7
Natural gas utility:
Supply and transportation	2048	1,564.7		324.1		258.3		162.1		116.7		75.0		628.5
Non-utility energy infrastructure:
Purchased power	2049	55.9		1.0		1.4		1.4		1.5		1.5		49.1
Total		$	12,002.8	$	1,211.9	$	1,025.9	$	900.8	$	883.3	$	871.9	$	7,109.0

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)
2019	$	8.7
2020	8.7
2021	6.8
2022	6.9
2023	7.1
Later years	48.7
Total	$	86.9

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)	2018		2017
Regulatory assets	$	687.1	$	676.6
Reserves for future remediation	616.4		617.2