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Income Taxes (Income Tax Uncertainties) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income Tax Contingency [Line Items] |  |  |
Document Period End Date | Dec. 31, 2018 |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Balance at beginning of period | $ 21.6 | $ 29.6 | $ 29.8
Additions for tax positions of the current year | 0.0 | 2.3 | 0.3
Additions for tax positions of prior years | 0.5 | 1.3 | 1.0
Reductions for tax positions of prior years | (0.8) | (11.3) | (0.7)
Lapses of applicable statutes of limitations | (6.1) | (0.3) | (0.8)
Settlements during the period | (0.8) | 0.0 | 0.0
Balance at end of period | 14.4 | 21.6 | 29.6
Unrecognized tax benefits that would impact the effective tax rate, if recognized | 14.4 |  |
Interest (income) expense | (2.8) | (2.5) | 1.0
Penalties (refunds) | (0.4) | 0.1 | 0.0
Accrued interest related to income tax uncertainties | 0.5 | 3.3 |
Accrued penalties related to income tax uncertainties | 0.1 | 0.5 |
Federal rate change | (0.8) | (28.8) | $ 0.0
Provisional decrease to deferred income taxes due to Tax Act | (24.5) |  |
Decrease in uncertain tax positions due to Tax Act | 0.8 |  |
Tax act, provisional income tax benefit | (23.7) |  |
Resolution of Audits or Statute Expirations |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Reasonably possible decrease in unrecognized tax benefits | 4.6 |  |
Other Current Liabilities |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Accrued interest related to income tax uncertainties | 0.2 | 0.1 |
Accrued penalties related to income tax uncertainties | 0.1 | 0.2 |
Other Noncurrent Liabilities |  |  |
Reconciliation of Unrecognized Tax Benefits, Excluding Amounts Pertaining to Examined Tax Returns [Roll Forward] |  |  |
Accrued interest related to income tax uncertainties | 0.3 | 3.2 |
Accrued penalties related to income tax uncertainties | $ 0.0 | $ 0.3 |

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- Definition Amount of decrease reasonably possible in the next twelve months for the unrecognized tax benefit. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (d)(3) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + 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 income tax rates. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -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 3: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 45 -Paragraph 15 -URI http://asc.fasb.org/extlink&oid=84176650&loc=d3e32059-109318 + Details
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- Definition Amount of expense for penalties related to a tax position claimed or expected to be claimed in the tax return. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 15 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32718-109319 + Details
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