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Common Equity - Performance Units (Details) - Performance units - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2025	Dec. 31, 2024	Dec. 31, 2023	Dec. 31, 2022
Share-based Compensation Arrangement by Share-based Payment Award
Performance units granted		205,051	157,035	171,492
Intrinsic value of settled performance units		$ 2.4	$ 10.2	$ 20.2
Tax benefit from distribution of performance units		$ 0.6	$ 2.6	$ 5.1
Performance units outstanding		466,679
Liability recorded on balance sheet		$ 34.7
Compensation cost not yet recognized		$ 22.5
Weighted-average period over which unrecognized compensation cost is expected to be recognized		1 year 8 months 12 days
Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award
Performance units granted	185,945
Intrinsic value of settled performance units	$ 14.1
Tax benefit from distribution of performance units	$ 3.4