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Income Tax Matters, Reconciliation Between Income Tax Provision and Statutory Income Tax Provision Table (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Reconciliation between income tax provision and statutory income tax provision: |  |  |
Amount of federal income tax provision based on the statutory rate | $ (16.9) | $ (25.2) | $ (46.5)
(Increase) decrease in federal valuation allowances | (0.1) | 1.7 | 0.5
Non-deductible compensation expense | (1.7) | (0.6) | (2.3)
Non-deductible benefit (expense) | 0.1 | (1.5) | 0.0
State income taxes, net of federal benefit | (4.5) | (2.5) | (4.3)
Research and development credit | 7.7 | 0.0 | 0.0
Gross increases for tax positions from current year | (0.3) | 0.0 | 0.0
Gross increases for tax positions from prior years | (2.4) | 0.0 | 0.0
Foreign income tax expense | (0.1) | (0.5) | (0.1)
Foreign undistributed (earnings) loss | (0.2) | 0.4 | (5.9)
Tax rate change | 0.0 | 0.1 | 29.0
Income tax provision | (18.4) | (28.3) | (87.6)
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount |  |  | (2.5)
State and Local Jurisdiction [Member] |  |  |
Reconciliation between income tax provision and statutory income tax provision: |  |  |
(Increase) decrease in federal valuation allowances | (1.4) | 2.9 | 2.2
State and tax expense (benefit) before adjustments | 3.8 | 4.5 | $ 4.0
Effective Income Tax Rate Reconciliation, Change in Enacted Tax Rate, Amount | $ 0.7 | $ (0.9) |

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- Definition Amount of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 280 -SubTopic 10 -Section 50 -Paragraph 22 -Subparagraph (h) -URI http://asc.fasb.org/extlink&oid=115929826&loc=d3e8736-108599 Reference 2: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 235 -SubTopic 10 -Section S99 -Paragraph 1 -Subparagraph (SX 210.4-08(h)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: http://www.xbrl.org/2003/role/disclosureRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 20 -Section 45 -Paragraph 2 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=109238882&loc=d3e38679-109324 + Details
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- Definition Amount of the difference between reported income tax expense (benefit) and expected income tax expense (benefit) computed by applying the domestic federal statutory income tax rates to pretax income (loss) from continuing operations attributable to increase (decrease) in the valuation allowance for deferred tax assets. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 13 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32698-109319 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 20 -URI http://asc.fasb.org/extlink&oid=116821951&loc=d3e32123-109318 + Details
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