Credit Losses - Rollforward of Allowances (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	$ 198.3	$ 220.1	$ 140.0
Provision for credit losses	86.1	75.7	102.9
Provision for credit losses deferred for future recovery or refund	62.9	(13.1)	55.2
Write-offs charged against the allowance	(206.0)	(129.8)	(132.3)
Recovery of amounts previously written off	58.0	45.4	54.4
Sale of PDL residential solar facilities			(0.1)
Balance at End of Year	199.3	198.3	220.1
Change in allowance for credit losses	1.0
Public utilities
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	198.3	220.1	139.9
Provision for credit losses	86.1	75.7	102.9
Provision for credit losses deferred for future recovery or refund	62.9	(13.1)	55.2
Write-offs charged against the allowance	(206.0)	(129.8)	(132.3)
Recovery of amounts previously written off	58.0	45.4	54.4
Sale of PDL residential solar facilities			0.0
Balance at End of Year	199.3	198.3	220.1
Wisconsin | Public utilities
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	84.0	102.1	59.9
Provision for credit losses	50.5	46.4	47.5
Provision for credit losses deferred for future recovery or refund	29.7	(16.6)	24.6
Write-offs charged against the allowance	(117.0)	(74.8)	(65.9)
Recovery of amounts previously written off	34.8	26.9	36.0
Sale of PDL residential solar facilities			0.0
Balance at End of Year	82.0	84.0	102.1
Illinois | Public utilities
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	105.5	111.6	75.9
Provision for credit losses	33.0	25.6	51.1
Provision for credit losses deferred for future recovery or refund	33.2	3.5	30.6
Write-offs charged against the allowance	(82.6)	(52.5)	(63.0)
Recovery of amounts previously written off	21.9	17.3	17.0
Sale of PDL residential solar facilities			0.0
Balance at End of Year	111.0	105.5	111.6
Other States | Public utilities
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	8.8	6.4	4.1
Provision for credit losses	2.6	3.7	4.3
Provision for credit losses deferred for future recovery or refund	0.0	0.0	0.0
Write-offs charged against the allowance	(6.4)	(2.5)	(3.4)
Recovery of amounts previously written off	1.3	1.2	1.4
Sale of PDL residential solar facilities			0.0
Balance at End of Year	6.3	8.8	6.4
Corporate and Other
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Balance at Beginning of Year	0.0	0.0	0.1
Provision for credit losses	0.0	0.0	0.0
Provision for credit losses deferred for future recovery or refund	0.0	0.0	0.0
Write-offs charged against the allowance	0.0	0.0	0.0
Recovery of amounts previously written off	0.0	0.0	0.0
Balance at End of Year	$ 0.0	$ 0.0	0.0
Corporate and Other | WPS Power Development, LLC Residential Solar Facilities
Accounts Receivable, Allowance for Credit Loss [Roll Forward]
Sale of PDL residential solar facilities			$ (0.1)