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Income Taxes, Tax Credits and Unrecognized Tax Benefits (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |
Gross Unrecognized Tax Benefits, Including Interest | $ 3.9 | $ 2.3 | $ 2.3
Reconciliation of the total amounts of unrecognized tax benefits [Roll Forward] |  |  |
Balance at January 1 | 2.3 | 2.1 | 3.4
Gross Increases - Tax Positions Prior Periods | 2.0 | 0.6 | 0.1
Gross Decreases - Tax Positions Prior Periods | (0.8) | (0.7) | (0.2)
Gross Increases - Current Period Tax Positions | 0.4 | 0.4 | 0.4
Decreases - Settlements with Taxing Authorities | 0.0 | (0.1) | (0.5)
Reductions - Lapse of Statute of Limitations | (0.2) | 0.0 | (1.1)
Balance at December 31 | 3.7 | 2.3 | $ 2.1
Possible Decrease in Unrecognized Tax Benefits in 2017 | 0.6 |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforward, Amount | 73.6 |  |
Tax Credit Carryforwards | 71.8 | $ 53.2 |
Tax Credit Carryforward, Expiration Date | 73.6 |  |
General Business Credits [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforwards | 31.0 |  |
State Tax Credits [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforwards | $ 42.6 |  |

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- Definition Amount, before allocation of a valuation allowances, of deferred tax assets attributable to deductible tax credit carryforwards including, but not limited to, research, foreign, general business, alternative minimum tax, and other deductible tax credit carryforwards. + References Reference 1: 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 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 3 -Subparagraph (a) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32559-109319 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -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 + Details
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- Definition The amount of the unrecognized tax benefit of a position taken for which it is reasonably possible that the total amount thereof will significantly increase or decrease within twelve months of the balance sheet date. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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