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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