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OTHER DISCLOSURES. (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Expense recognized for defined contribution retirement plans	$ 104.6	$ 105.6	$ 89.4
Senior officers | Supplemental Savings Plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Supplemental Savings Plan, minimum deferral period	2 years
Supplemental Savings Plan, maximum deferral period	15 years
Amount of cash incentive compensation senior officers elected to defer	$ 107.5	$ 118.9	$ 95.5
Maximum | Senior officers | Supplemental Savings Plan
Deferred Compensation Arrangement with Individual, Excluding Share-based Payments and Postretirement Benefits [Line Items]
Deferral percentage of cash incentive compensation	100.00%

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Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 715
-SubTopic 70
-Section 50
-Paragraph 1
-URI http://asc.fasb.org/extlink&oid=49170846&loc=d3e28014-114942

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