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Common Equity - Stock-Based Compensation Expense (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2022 | Dec. 31, 2021 | Dec. 31, 2020
Share Based Compensation Arrangement By Share Based Payment Award |  |  |
Stock-based compensation expense | $ 34.8 | $ 15.7 | $ 35.7
Related tax benefit | 9.6 | 4.3 | 9.8
Stock options |  |  |
Share Based Compensation Arrangement By Share Based Payment Award |  |  |
Stock-based compensation expense | 6.5 | 6.5 | 6.0
Restricted stock |  |  |
Share Based Compensation Arrangement By Share Based Payment Award |  |  |
Stock-based compensation expense | 7.0 | 6.1 | 7.4
Performance units |  |  |
Share Based Compensation Arrangement By Share Based Payment Award |  |  |
Stock-based compensation expense | $ 21.3 | $ 3.1 | $ 22.3

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- Definition Amount of expense for award under share-based payment arrangement. Excludes amount capitalized. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 10 -Section 50 -Paragraph 2 -Subparagraph (h)(1)(i) -URI https://asc.fasb.org/extlink&oid=128089324&loc=d3e5070-113901 + Details
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