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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Reclassification Adjustments) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Reclassification Adjustment out of Accumulated Other Comprehensive Income [Line Items] |  |  |
Non-operating income | $ (396.3) | $ (227.1) | $ (103.5)
Provision for income taxes | 923.9 | 706.5 | 779.4
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 | (110.2) | (53.0) | (72.5)
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 | 1.4 | 2.4 | 7.9
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 | 32.5 | 20.9 | 20.7
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 | 9.2 | 0.0 | 0.0
Other-than-temporary impairments [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 | 0.0 | (1.9)
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 | (0.1) | (2.2) | 5.8
Provision for income taxes | 0.0 | 0.8 | (1.2)
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 | (110.3) | (55.2) | (66.7)
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 | $ (0.1) | $ (2.2) | $ 5.8

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