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Common Equity - Performance Units (Details) - Performance units - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Mar. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance units granted |  | 148,036 | 217,560 | 237,650
Intrinsic value of settled performance units |  | $ 18.7 | $ 9.7 | $ 6.7
Tax benefit from distribution of performance units |  | $ 4.4 | $ 2.2 | $ 2.1
Performance units outstanding |  | 539,475 |  |
Liability recorded on balance sheet |  | $ 58.1 |  |
Compensation cost not yet recognized |  | $ 20.5 |  |
Weighted-average period over which unrecognized compensation cost is expected to be recognized |  | 1 year 7 months 6 days |  |
Subsequent event |  |  |  |
Share-based Compensation Arrangement by Share-based Payment Award [Line Items] |  |  |  |
Performance units granted | 140,455 |  |  |
Intrinsic value of settled performance units | $ 34.2 |  |  |
Tax benefit from distribution of performance units | $ 8.4 |  |  |

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- Definition Sum of the carrying amounts as of the balance sheet date of all liabilities that are recognized. Liabilities are probable future sacrifices of economic benefits arising from present obligations of an entity to transfer assets or provide services to other entities in the future. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 210 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.5-02.19-26) -URI http://asc.fasb.org/extlink&oid=6877327&loc=d3e13212-122682 + Details
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