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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
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 | $ (14.6) | $ 0.6 | $ 5.1
Total net deferred tax benefits (income taxes) | 28.5 | 23.9 | 31.8
Capital gain distributions [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 1.4 | 2.4 | 7.9
Net gains realized on dispositions [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 32.5 | 20.9 | 20.7
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 | 9.2 | 0.0 | 0.0
Other-than-temporary impairments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 0.0 | 0.0 | (1.9)
Currency translation adjustments [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Net deferred tax benefits (income taxes) on other comprehensive income before reclassifications | (18.5) | 3.5 | 3.8
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 0.0 | 0.8 | (1.2)
Total net deferred tax benefits (income taxes) | (18.5) | 4.3 | 2.6
Total accumulated other comprehensive income [Member] |  |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |  |
Total net deferred tax benefits (income taxes) | $ 10.0 | $ 28.2 | $ 34.4

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