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v3.22.0.1

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 |  | 152,382 | 153,465 | 148,036
Intrinsic value of settled performance units |  | $ 27.7 | $ 34.5 | $ 18.7
Tax benefit from distribution of performance units |  | $ 6.8 | $ 8.4 | $ 4.4
Performance units outstanding |  | 449,290 |  |
Liability recorded on balance sheet |  | $ 21.3 |  |
Compensation cost not yet recognized |  | $ 10.8 |  |
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 | 171,492 |  |  |
Intrinsic value of settled performance units | $ 15.7 |  |  |
Tax benefit from distribution of performance units | $ 3.8 |  |  |

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