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CONSOLIDATED STATEMENTS OF STOCKHOLDERS' EQUITY (Parenthetical) - USD ($) $ in Millions		12 Months Ended
		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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- Definition

Aggregate dividends declared during the period for each share of common stock outstanding.

+ References

Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
-Section S99
-Paragraph 1
-Subparagraph (SX 210.3-04)
-URI http://asc.fasb.org/extlink&oid=27012166&loc=d3e187085-122770

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