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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Cash dividends declared per share (in dollars per share) |  | $ 2.80 | $ 2.28 | $ 2.16
Accounting standards update 2018-02, available for sale securities [Member] | Retained earnings [Member] |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  | $ (1.7) |
Accounting standards update 2018-02, available for sale securities [Member] | AOCI [Member] |  |  |  |
Cumulative effect of adopting new accounting guidance | [1] |  | $ 1.7 |
[1] | Includes the reclassification of $1.7 million of stranded income taxes on available-for-sale investments resulting from U.S. tax law changes enacted on December 22, 2017, from accumulated other comprehensive income to retained earnings.

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