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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Deferred Tax Benefits (Income Taxes)) (Details) - USD ($)
$ in Millions
 12 Months Ended
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