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Income Taxes - Tax Effects Of Temporary Differences (Details) - USD ($) $ in Millions | Dec. 31, 2020 | Dec. 31, 2019
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Income Tax Disclosure [Abstract] |  |
NOL and tax credit carryforwards | $ 471.6 | $ 612.9
163 (j) interest expense carryforward | 65.7 | 49.3
Lease liabilities | 32.5 | 22.1
ROU asset | (32.5) | (22.1)
Tax-deductible goodwill and amortizable intangibles | (38.0) | (48.6)
Capitalization of research and development expenses | 90.7 | 42.7
Reserves and accruals | 68.4 | 27.5
Property, plant and equipment | (95.8) | (81.2)
Inventories | 84.3 | 22.0
Undistributed earnings of foreign subsidiaries | (57.5) | (63.7)
Share-based compensation | 7.7 | 10.3
Pension | 21.2 | 26.3
Other | 3.2 | 8.0
Deferred tax assets and liabilities before valuation allowance | 621.5 | 605.5
Valuation allowance | (249.9) | (357.9)
Net deferred tax asset | $ 371.6 | $ 247.6

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- Definition Amount before allocation of valuation allowances of deferred tax asset attributable to deductible temporary differences from in-process research and development costs expensed in connection with a business combination. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 6 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32621-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32632-109319 + Details
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