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STOCKHOLDERS' EQUITY. (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended
	Mar. 31, 2018	Mar. 31, 2017
Stockholders' Equity Note [Line Items]
Cash dividends declared per share	$ 0.7	$ 0.57
Accounts payable and accrued expenses	$ 22.2
Regular cash dividend [Member]
Stockholders' Equity Note [Line Items]
Cash dividends declared per share	$ 0.7	$ 0.57

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- Definition

[Line Items] for Stockholders' Equity Note [Table]

+ References

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- Definition

Unsettled Common Stock Repurchases Liabilities

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- Definition

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

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-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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