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Income Taxes - Deferred Tax Asset and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred income tax assets:    
Net operating loss $ 66.0 $ 77.3
Property, net 30.8 36.3
Insurance reserve 16.8 19.9
Stock-based compensation 33.0 19.5
Revenue reserves 6.1 14.0
Other accruals 22.5 20.4
Tax credits 4.7 2.8
Other 0.6 0.5
Total deferred income tax assets 180.5 190.7
Less: Valuation allowance (33.7) (35.8)
Net deferred income tax assets 146.8 154.9
Deferred income tax liabilities:    
Deferred revenue 0.0 (28.9)
Intangibles (88.5) (80.0)
Carrying value of partnerships (15.2) (11.4)
Other (0.2) (0.2)
Total deferred income tax liabilities (103.9) (120.5)
Net deferred income tax assets $ 42.9 $ 34.4