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INCOME TAXES. (Net Deferred Tax Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
--- | --- | ---
Deferred tax liabilities |  |
Property and equipment | $ (49.3) | $ (46.3)
Operating lease assets | (33.9) |
Net unrealized holding gains recognized in income | (93.1) | (30.1)
Other | (22.1) | (20.4)
Total deferred tax liabilities | (198.4) | (96.8)
Deferred tax assets |  |
Stock-based compensation | 81.1 | 85.6
Asset impairments | 10.3 | 7.9
Operating lease liabilities | 33.9 |
Accrued compensation | 5.3 | 6.6
Supplemental savings plan | 117.6 | 84.0
Currency translation adjustment | 11.9 | 11.4
Other | 15.4 | 11.2
Total deferred tax assets | 275.5 | 206.7
Net deferred tax asset | $ 77.1 | $ 109.9

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