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STOCK-BASED COMPENSATION. (Future Stock-Based Compensation Expense) (Details) $ in Millions	Dec. 31, 2017 USD ($)
Disclosure of Compensation Related Costs, Share-based Payments [Abstract]
First quarter 2018	$ 47.3
Second quarter 2018	46.7
Third quarter 2018	46.0
Fourth quarter 2018	40.3
Total 2018	180.3
2019 through 2023	176.1
Total	$ 356.4

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Unrecognized cost of unvested share-based compensation awards to be recognized in the second fiscal year through vesting period.

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Unrecognized cost of unvested share-based compensation awards to be recognized in the next fiscal year.

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Employee Service Share-based Compensation, Nonvested Awards, Compensation Cost To Be Recognized Quarter Four Of Next Fiscal Year

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Unrecognized cost of unvested share-based compensation awards.

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=96867065&loc=d3e5070-113901

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