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Income Taxes - Tax Effects Of Temporary Differences (Details) - USD ($) $ in Millions | Dec. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Net operating loss and tax credit carryforwards | $ 612.9 | $ 584.9
163 (j) interest expense carryforward | 49.3 | 0.0
Tax-deductible goodwill and amortizable intangibles | (48.6) | (29.4)
Capitalization of research and development expenses | 42.7 | 0.0
Reserves and accruals | 27.5 | 57.4
Property, plant and equipment | (81.2) | (63.5)
Inventories | 22.0 | 20.2
Undistributed earnings of foreign subsidiaries | (63.7) | (48.7)
Share-based compensation | 10.3 | 7.7
Pension | 26.3 | 24.3
Other | 8.0 | 6.0
Deferred tax assets and liabilities before valuation allowance | 605.5 | 558.9
Valuation allowance | (357.9) | (347.5)
Net deferred tax asset | $ 247.6 | $ 211.4

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