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COMMON EQUITY - PERFORMANCE UNITS (Details) - Performance units - USD ($) $ in Millions	3 Months Ended	12 Months Ended
	Mar. 31, 2022	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Compensation Arrangement by Share-based Payment Award
Performance units granted		5,437	7,017	8,178
Intrinsic value of settled performance units		$ 1.2	$ 1.8	$ 0.8
Tax benefit from distribution of performance units		$ 0.2	$ 0.4	$ 0.2
Performance units outstanding		17,742
Liability recorded on balance sheet		$ 0.9
Compensation cost not yet recognized		$ 1.9
Weighted-average period over which unrecognized compensation cost is expected to be recognized		2 years
Subsequent event
Share-based Compensation Arrangement by Share-based Payment Award
Performance units granted	6,608
Intrinsic value of settled performance units	$ 0.7
Tax benefit from distribution of performance units	$ 0.1