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OTHER COMPREHENSIVE INCOME AND ACCUMULATED OTHER COMPREHENSIVE INCOME. (Deferred Tax Benefits (Income Taxes)) (Details) - USD ($) $ in Millions | 3 Months Ended
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Mar. 31, 2018 | Mar. 31, 2017
Net unrealized holding gains or losses [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net deferred tax benefits (income taxes) on other comprehensive income (loss) before reclassifications | $ 0.0 | $ (7.1)
Total net deferred tax benefits (income taxes) | 0.0 | 11.5
Net gains realized on dispositions [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 0.0 | 18.6
Currency translation adjustments [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Net deferred tax benefits (income taxes) on other comprehensive income (loss) before reclassifications | (3.3) | (0.8)
Net deferred tax benefits (income taxes) on reclassifications from AOCI | 0.8 | 0.0
Total net deferred tax benefits (income taxes) | (2.5) | (0.8)
Total accumulated other comprehensive income (loss) [Member] |  |
Accumulated Other Comprehensive Income (Loss) [Line Items] |  |
Total net deferred tax benefits (income taxes) | $ (2.5) | $ 10.7

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