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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Cash dividends declared per share (in dollars per share) | $ 3.04 | $ 2.80 | $ 2.28
Accounting standards update 2018-02, available for sale securities | Retained earnings |  |  |
Cumulative effect of adopting new accounting guidance |  |  | $ 1.7

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