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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Reclassification Adjustments) (Details) - USD ($)
$ in Millions
 12 Months Ended
Dec. 31, 2018
Dec. 31, 2017
Dec. 31, 2016
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Non-operating income $ (23.2) $ (396.3) $ (227.1)
Provision for income taxes 615.9 923.9 706.5
Net unrealized holding gains or losses [Member] | Reclassification out of accumulated other comprehensive income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Non-operating income 0.0 (110.2) (53.0)
Capital gain distributions [Member] | Reclassification out of accumulated other comprehensive income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Provision for income taxes 0.0 1.4 2.4
Net gains realized on dispositions [Member] | Reclassification out of accumulated other comprehensive income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Provision for income taxes 0.0 32.5 20.9
Net gains recognized upon transfer to trading investments [Member] | Reclassification out of accumulated other comprehensive income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Provision for income taxes 0.0 9.2 0.0
Currency translation adjustments [Member] | Reclassification out of accumulated other comprehensive income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Non-operating income (3.6) (0.1) (2.2)
Provision for income taxes 0.9 0.0 0.8
Total accumulated other comprehensive income [Member] | Reclassification out of accumulated other comprehensive income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Non-operating income (3.6) (110.3) (55.2)
Variable interest entities [Member] | Currency translation adjustments [Member] | Reclassification out of accumulated other comprehensive income [Member]      
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items]      
Non-operating income $ (3.6) $ (0.1) $ (2.2)