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Shareholders' Equity and Long-Term Incentive Compensation - Common Stock in Treasury, Dividends and Preferred Stock (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Preferred Stock |  |  |
Preferred stock outstanding (shares) | 0 | 0 | 0
Authorized no par value preferred stock (in shares) | 3,000,000.0 | 3,000,000.0 | 3,000,000.0
Common Stock In Treasury |  |  |
Common Stock in Treasury |  |  |
Decrease in stock by the settlement of restricted stock units | $ 15.8 | $ 27.6 | $ 16.9

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