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SUMMARY OF SIGNIFICANT ACCOUNTING POLICIES. (Newly issued but not yet adopted accounting guidance) (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015	Jan. 01, 2018	Dec. 31, 2014
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of revenue related expenses to operating expenses									$ 2,684.2	$ 2,489.5	$ 2,301.7
Reclassification of revenue related expenses from revenue to operating expenses	$ 1,286.1	$ 1,221.7	$ 1,171.6	$ 1,113.6	$ 1,091.2	$ 1,092.9	$ 1,044.7	$ 994.1	4,793.0	4,222.9	4,200.6
Reclassification of unrealized holding gains recognized on investments from AOCI to retained earnings	5,824.4				5,008.6				5,824.4	5,008.6	4,762.0		$ 5,395.2
Pro forma [Member] | ASU 2014-09 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of revenue related expenses to operating expenses									60.0	60.0
Reclassification of revenue related expenses from revenue to operating expenses									60.0	60.0
Net unrealized holding gains or losses [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of unrealized holding gains recognized on investments from AOCI to retained earnings	$ 7.9				$ 52.2				$ 7.9	$ 52.2	$ 120.3		$ 165.5
Subsequent event [Member] | Net unrealized holding gains or losses [Member] | ASU 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of unrealized holding gains recognized on investments from AOCI to retained earnings												$ (7.9)
Subsequent event [Member] | Retained earnings [Member] | ASU 2016-01 [Member]
New Accounting Pronouncements or Change in Accounting Principle [Line Items]
Reclassification of unrealized holding gains recognized on investments from AOCI to retained earnings												$ 7.9

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Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
-Name Accounting Standards Codification
-Topic 210
-SubTopic 10
-Section S99
-Paragraph 1
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