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Consolidated Statement of Shareholders Equity (Parenthetical) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
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Sep. 30, 2019 | [1] | Jun. 30, 2019 | Mar. 31, 2019 | Sep. 30, 2018 | [1] | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Common stock cash dividends (in dollars per share) | $ 2.41 | $ 1.16 | $ 1.16 | $ 2.17 | $ 1.01 | $ 1.01 | $ 4.73 | $ 4.19 | $ 3.83
Stock option exercises and other, tax benefits |  |  |  |  |  |  | $ 0.0 | $ 0.0 | $ 0.0
[1] | Includes a $1.16 and $1.01 per share dividend declared and paid in third quarter of 2019 and 2018, respectively, and a $1.25 and $1.16 per share dividend declared in the third quarter and paid in fourth quarter of 2019 and 2018, respectively.

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