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INCOME TAXES. (Net Deferred Tax Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Deferred tax liabilities |  |
Property and equipment | $ (46.3) | $ (35.3)
Net unrealized holding gains recognized in income | (30.1) | (53.9)
Net unrealized holding gains on investments held as available-for-sale | 0.0 | (3.1)
Other | (20.4) | (18.9)
Total deferred tax liabilities | (96.8) | (111.2)
Deferred tax assets |  |
Stock-based compensation | 85.6 | 92.7
Asset impairments | 7.9 | 8.8
Accrued compensation | 6.6 | 4.4
Supplemental savings plan | 84.0 | 66.6
Currency translation adjustment | 11.4 | 2.2
Other | 11.2 | 6.8
Total deferred tax assets | 206.7 | 181.5
Net deferred tax asset | $ 109.9 | $ 70.3

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