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Income Taxes - Net Deferred Income Tax Asset (Liability) (Details) - USD ($)
$ in Millions
Dec. 31, 2020
Dec. 31, 2019
Dec. 31, 2018
Deferred income tax asset (liability):      
Depreciation and amortization $ (393.7) $ (366.7)  
Investment in partnership 0.0 (38.1)  
Right of use assets (44.3) (30.5)  
Unremitted earnings (42.0) (29.0)  
Inventory basis differences 27.7 32.7  
Accrued liabilities 81.4 91.3  
Lease obligations 45.3 30.5  
Share-based compensation 24.5 23.2  
Federal benefit of unrecognized tax positions 23.5 20.7  
Loss and credit carryforwards 390.1 373.3  
R&D credit carryforwards 48.4 54.1  
Interest carryforwards 17.9 60.5  
Other, net 0.9 4.1  
Subtotal 179.7 226.1  
Valuation allowance (414.8) [1] (501.3) [1] $ (557.9)
Net deferred income tax liability (235.1) (275.2)  
Assets 44.2 5.4  
Liabilities $ (279.3) $ (280.6)  
[1] The movement in the valuation allowance balance differs from the amount in the effective tax rate reconciliation due to adjustments affecting balance sheet only items and foreign currency.