Operating Revenues - Other Non-Utility Operating Revenues (Details) - Revenues from contracts with customers - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 8,467.7	$ 8,785.3	$ 9,568.1
Other non-utility revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	235.2	208.1	143.2
Other non-utility revenues | We Power revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	24.3	23.5	23.4
Other non-utility revenues | Other
Disaggregation of Operating Revenues
Revenues from contracts with customers	0.0	0.1	0.1
Transferred over time | Other non-utility revenues | Renewable generation revenues
Disaggregation of Operating Revenues
Revenues from contracts with customers	190.5	164.9	101.0
Transferred over time | Other non-utility revenues | Appliance service repairs
Disaggregation of Operating Revenues
Revenues from contracts with customers	$ 20.4	$ 19.6	$ 18.7