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Income Taxes - Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Effective Tax Rate Reconciliation |  |  |
Income tax expense at U.S. statutory rate | $ 15.6 | $ 17.9 | $ 7.3
State income taxes, net of federal tax benefit | 3.6 | (0.9) | (2.3)
Foreign income, net of credit on foreign taxes | 2.1 | 0.0 | (1.3)
Effective tax rate differential of earnings outside of U.S. | 1.8 | 2.4 | 0.0
Change in valuation allowance | (5.9) | (4.2) | 1.0
Research & experimentation credits | (0.9) | (1.0) | (0.9)
Foreign derived intangible income | (0.8) | (0.2) | (1.2)
Net non-deductible items | 1.6 | 1.2 | 2.3
Change in uncertain tax positions | (0.2) | (0.6) | 0.0
Share-based compensation | (2.2) | (1.7) | (2.8)
Tax effect of 2017 tax reform federal rate change | 0.0 | (0.2) | 0.0
Other items | (1.2) | 2.2 | 0.7
Income tax expense, net | $ 13.5 | $ 14.9 | $ 2.8

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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 -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=121826272&loc=d3e32687-109319 Reference 2: http://www.xbrl.org/2009/role/commonPracticeRef -Publisher FASB -Name Accounting Standards Codification -Topic 718 -SubTopic 740 -Section 35 -Paragraph 2 -URI http://asc.fasb.org/extlink&oid=120384911&loc=d3e23163-113944 + Details
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