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STOCK-BASED COMPENSATION. (Future Stock-Based Compensation Expense) (Details) $ in Millions	Dec. 31, 2019 USD ($)
Share-based Payment Arrangement [Abstract]
First quarter 2020	$ 59.6
Second quarter 2020	54.5
Third quarter 2020	53.2
Fourth quarter 2020	46.3
Total 2020	213.6
2021 through 2025	198.0
Total	$ 411.6

X

- Definition

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

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- Definition

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

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- Definition

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

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- Definition

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

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

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

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- Definition

Amount of cost not yet recognized for nonvested award under share-based payment arrangement.

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 718
-SubTopic 10
-Section 50
-Paragraph 2
-Subparagraph (i)
-URI http://asc.fasb.org/extlink&oid=116856206&loc=d3e5070-113901

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