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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Deferred Tax Benefits (Income Taxes)) (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Currency translation adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on other comprehensive income before reclassifications | $ 8.3 | $ (18.5) | $ 3.5
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 0.9 | 0.0 | 0.8
Total net deferred tax benefits (income taxes) | 9.2 | (18.5) | 4.3
Net unrealized holding gains or losses [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on other comprehensive income before reclassifications | 0.0 | (14.6) | 0.6
Total net deferred tax benefits (income taxes) | 0.0 | 28.5 | 23.9
Capital gain distributions [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 0.0 | 1.4 | 2.4
Net gains realized on dispositions [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 0.0 | 32.5 | 20.9
Net gains recognized upon transfer to trading investments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 0.0 | 9.2 | 0.0
Total accumulated other comprehensive income [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total net deferred tax benefits (income taxes) | $ 9.2 | $ 10.0 | $ 28.2

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