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INCOME TAXES. (Net Deferred Tax Assets) (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
--- | --- | ---
Deferred tax assets |  |
Stock-based compensation | $ 79.3 | $ 81.1
Asset impairments | 7.4 | 10.3
Operating lease liabilities | 34.9 | 33.9
Accrued compensation | 7.5 | 5.3
Supplemental savings plan | 160.9 | 117.6
Currency translation adjustment | 0.2 | 11.9
Other | 13.5 | 15.4
Total deferred tax assets | 303.7 | 275.5
Deferred tax liabilities |  |
Property and equipment | (64.9) | (49.3)
Operating lease assets | (34.9) | (33.9)
Net unrealized holding gains recognized in income | (130.9) | (93.1)
Net unrealized holding gains on investments held as available-for-sale |  | 0.0
Other | (12.4) | (22.1)
Total deferred tax liabilities | (243.1) | (198.4)
Net deferred tax asset | $ 60.6 | $ 77.1

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