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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, 2019
Dec. 31, 2018
Dec. 31, 2017
Currency translation adjustments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net deferred tax benefits (income taxes) on other comprehensive income before reclassifications $ 0.5 $ 8.3 $ (18.5)
Net deferred tax benefits (income taxes) on reclassifications from AOCI 0.0 0.9 0.0
Total net deferred tax benefits (income taxes) 0.5 9.2 (18.5)
Net unrealized holding gains or losses      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net deferred tax benefits (income taxes) on other comprehensive income before reclassifications 0.0 0.0 (14.6)
Total net deferred tax benefits (income taxes) 0.0 0.0 28.5
Capital gain distributions      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net deferred tax benefits (income taxes) on reclassifications from AOCI 0.0 0.0 1.4
Net gains realized on dispositions      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net deferred tax benefits (income taxes) on reclassifications from AOCI 0.0 0.0 32.5
Net gains recognized upon transfer to trading investments      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Net deferred tax benefits (income taxes) on reclassifications from AOCI 0.0 0.0 9.2
Total accumulated other comprehensive income      
Accumulated Other Comprehensive Income (Loss) [Line Items]      
Total net deferred tax benefits (income taxes) $ 0.5 $ 9.2 $ 10.0