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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, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Income Tax Disclosure [Abstract] |  |  |
Gross Unrecognized Tax Benefits, Including Interest | $ 2.3 | $ 3.5 | $ 4.8
Reconciliation of the total amounts of unrecognized tax benefits [Roll Forward] |  |  |
Balance at January 1 | 3.4 | 4.7 | 4.8
Gross Increases - Tax Positions Prior Periods | 0.1 | 0.3 | 0.4
Gross Decreases - Tax Positions Prior Periods | (0.2) | (0.4) | (0.1)
Gross Increases - Current Period Tax Positions | 0.4 | 0.5 | 0.5
Decreases - Settlements with Taxing Authorities | (0.5) | 0.0 | (0.6)
Reductions - Lapse of Statute of Limitations | (1.1) | (1.7) | 0.0
Other | 0.0 | 0.0 | (0.3)
Balance at December 31 | 2.1 | 3.4 | $ 4.7
Possible Decrease in Unrecognized Tax Benefits in 2017 | 0.7 |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforward, Amount | 43.8 |  |
Tax Credit Carryforwards | 43.8 | $ 47.3 |
Tax Credit Carryforward, Expiration Date | 43.6 |  |
Tax Credit Carryforwards, Not Subject to Expiration | 0.2 |  |
General Business Credits [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforwards | 2.4 |  |
State Tax Credits [Member] |  |  |
Tax Credit Carryforward [Line Items] |  |  |
Tax Credit Carryforwards | $ 41.4 |  |

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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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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://www.xbrl.org/2003/role/presentationRef -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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