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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2023 | Dec. 31, 2022 | Dec. 31, 2021
Effective Tax Rate Reconciliation |  |  |
Income tax expense at U.S. statutory rate | $ 12.2 | $ 20.8 | $ 15.6
State income taxes, net of federal tax benefit | 3.1 | 1.5 | 3.1
Foreign withholding taxes | 6.3 | 0.2 | 1.6
U.S. taxation of international operations | 18.7 | 1.4 | (0.3)
Effective tax rate differential of earnings outside of United States | 2.8 | 1.7 | 1.8
Change in valuation allowance | (2.0) | (11.6) | (5.9)
Research & experimentation | (2.0) | (2.9) | (1.0)
Provision to return | 0.8 | 5.0 | 0.3
Non-deductible items | 0.1 | 0.4 | 2.4
Change in uncertain tax positions | 2.0 | (0.3) | (0.2)
Share-based compensation | 0.1 | (1.1) | (4.1)
Capital (loss) | (40.5) | 0.0 | 0.0
Unremitted earnings not permanently reinvested | 0.9 | 0.0 | 0.0
Other items | 0.5 | 0.8 | 0.2
Income tax expense, net | $ 3.0 | $ 15.9 | $ 13.5

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- Definition Amount of difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying domestic federal statutory income tax rate to pretax income (loss) from continuing operation, attributable to expense for award under share-based payment arrangement. Excludes expense determined to be nondeductible upon grant or after for award under share-based payment arrangement. + References Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef -Topic 740 -SubTopic 10 -Name Accounting Standards Codification -Section 50 -Paragraph 12 -Publisher FASB -URI https://asc.fasb.org//1943274/2147482685/740-10-50-12 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Name Accounting Standards Codification -Section 35 -Paragraph 2 -SubTopic 740 -Topic 718 -Publisher FASB -URI https://asc.fasb.org//1943274/2147480887/718-740-35-2 + Details
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