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STOCKHOLDERS' EQUITY. (Details) - USD ($) $ / shares in Units, $ in Millions			3 Months Ended		9 Months Ended
		Oct. 02, 2018	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Stockholders' Equity Note [Line Items]
Cash dividends declared per share			$ 0.7	$ 0.57	$ 2.1	$ 1.71
Unsettled common stock repurchases liability			$ 31.8		$ 31.8
Payments for Repurchase of Common Stock	[1]				$ 543.0	$ 456.7
Subsequent event [Member]
Stockholders' Equity Note [Line Items]
Payments for Repurchase of Common Stock		$ 31.8
Regular cash dividend [Member]
Stockholders' Equity Note [Line Items]
Cash dividends declared per share					$ 2.1	$ 1.71
[1] See note 12 for supplementary consolidating cash flow statements.

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

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Unsettled Common Stock Repurchases Liabilities

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

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 505
-SubTopic 10
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-Paragraph 1
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The cash outflow to reacquire common stock during the period.

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-Publisher FASB
-Name Accounting Standards Codification
-Topic 230
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-Section 45
-Paragraph 15
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