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Income Taxes - Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2018
Dec. 31, 2017
Deferred tax assets:    
Deferred revenue and cancellation reserves $ 47.2 $ 39.4
Allowances and accruals, including state NOL carryforward amounts 40.8 36.3
Credits and other 0.3 1.1
Valuation allowance (1.1) (0.6)
Total deferred tax assets 87.2 76.2
Deferred tax liabilities:    
Inventories (42.0) (20.9)
Goodwill (48.2) (35.0)
Property and equipment, principally due to differences in depreciation (78.0) (73.4)
Prepaid expenses and other (10.2) (3.2)
Total deferred tax liabilities (178.4) (132.5)
Total $ (91.2) $ (56.3)