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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