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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