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Common Equity - Share Repurchase Program (Details) - USD ($) shares in Millions, $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Stockholders' Equity Note [Abstract] |  |  |
New shares of common stock issued | 0.0 | 0.0 | 0.0
Shares purchased | 1.8 | 1.1 | 1.1
Cost of shares purchased | $ 140.1 | $ 72.4 | $ 71.3

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