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Income Taxes (Components of Income Tax Expense) (Details) - USD ($) $ in Millions | 12 Months Ended
--- | ---
Dec. 31, 2017 | Dec. 31, 2016 | Dec. 31, 2015
Current: |  |  |
Federal | $ 2.1 | $ 2.5 | $ 1.0
State | 0.1 | 1.0 | 0.9
International | 37.0 | 29.4 | 33.3
Current income tax provision | 39.2 | 32.9 | 35.2
Deferred: |  |  |
Federal and state | 41.8 | 21.8 | (13.2)
International | (0.1) | (0.3) | 4.3
Deferred income tax provision | 41.7 | 21.5 | (8.9)
Income tax expense | $ 80.9 | $ 54.4 | $ 26.3

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- Definition Amount of current foreign income tax expense (benefit) pertaining to income (loss) from continuing operations. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -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 2: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 9 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32639-109319 + Details
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