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Income Taxes - Schedule of U.S. and Foreign Deferred Tax Assets and Liabilities (Details) - USD ($)
$ in Millions
Dec. 31, 2017
Dec. 31, 2016
Deferred tax assets:    
Employee benefit plans $ 5.4 $ 7.1
Tax credit carryforwards 4.2 1.5
Accrued and prepaid expenses 31.7 38.6
Net operating loss carryforwards 46.5 90.7
Total deferred tax assets 87.8 137.9
Less: valuation allowance (7.6) (4.5)
Total net deferred tax assets 80.2 133.4
Deferred tax liabilities:    
Deferred state gain (5.8) (5.5)
Depreciation on tangible assets (469.7) (721.1)
Intangible assets (66.2) (98.9)
Total deferred tax liabilities (541.7) (825.5)
Net deferred tax liability $ (461.5) $ (692.1)