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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)

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