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Common Equity - Performance Units (Details) - Performance units - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2024	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Compensation Arrangement by Share-based Payment Award
Performance units granted		19,780	21,158	18,138
Intrinsic value of settled performance units		$ 1.2	$ 2.8	$ 3.1
Tax benefit from distribution of performance units		$ 0.3	$ 0.7	$ 0.7
Performance units outstanding		53,116
Liability recorded on balance sheet		$ 1.3
Compensation cost not yet recognized		$ 5.2
Weighted-average period over which unrecognized compensation cost is expected to be recognized		1 year 10 months 24 days
Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award
Performance units granted	25,242
Intrinsic value of settled performance units	$ 0.1