Property, Plant, and Equipment - Balances (Details) - USD ($) $ in Millions	Dec. 31, 2022	Dec. 31, 2021
Property, plant, and equipment
Accumulated depreciation	$ 10,383.8	$ 9,889.3
Net property, plant, and equipment	29,113.8	26,982.4
OCPP generating units 5-8 | WE
Property, plant, and equipment
Net book value of plant to be retired	812.5
Columbia generating unit 1 | WPS
Property, plant, and equipment
Net book value of plant to be retired	84.0
Columbia generating unit 2 | WPS
Property, plant, and equipment
Net book value of plant to be retired	189.1
Regulated operations
Property, plant, and equipment
Accumulated depreciation	8,416.2	8,894.9
Net	22,889.2	21,957.4
CWIP	972.1	406.0
Net property, plant, and equipment	23,861.3	22,363.4
Regulated operations | Electric - generation
Property, plant, and equipment
Property, plant, and equipment	5,480.5	6,981.4
Regulated operations | Electric - distribution
Property, plant, and equipment
Property, plant, and equipment	8,233.3	7,854.7
Regulated operations | Natural gas - distribution, storage, and transmission
Property, plant, and equipment
Property, plant, and equipment	14,203.3	13,526.6
Regulated operations | Property, plant, and equipment to be retired, net
Property, plant, and equipment
Property, plant, and equipment to be retired, net	1,085.6	277.0
Regulated operations | Other
Property, plant, and equipment
Property, plant, and equipment	2,302.7	2,212.6
Non-regulated operations
Property, plant, and equipment
Accumulated depreciation	1,082.3	994.4
Net	5,170.9	4,589.2
CWIP	81.6	29.8
Net property, plant, and equipment	5,252.5	4,619.0
Non-regulated operations | Other
Property, plant, and equipment
Property, plant, and equipment	23.8	27.0
Non-regulated operations | We Power generation
Property, plant, and equipment
Property, plant, and equipment	3,237.1	3,240.5
Non-regulated operations | Renewable generation
Property, plant, and equipment
Property, plant, and equipment	2,537.1	1,837.5
Non-regulated operations | Natural gas storage
Property, plant, and equipment
Property, plant, and equipment	292.2	289.9
Non-regulated operations | Corporate services
Property, plant, and equipment
Property, plant, and equipment	163.0	188.7
Non-Utility Energy Infrastructure | Non-regulated operations
Property, plant, and equipment
Property, plant, and equipment	$ 6,066.4	$ 5,367.9