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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended |
--- | --- | --- | ---
Sep. 30, 2018 | Sep. 30, 2017 | Sep. 30, 2018 | Sep. 30, 2017 | Dec. 31, 2017
Income Tax Disclosure [Abstract] |  |  |  |  |
Effective income tax rate (as percent) | 23.00% | 36.50% | 26.30% | 35.90% |
U.S. Federal statutory rate (as percent) |  |  | 21.00% |  |
Income Tax [Line Items] |  |  |  |  |
Tax expense related to the Tax Act of December 2017 |  |  | $ (0.2) |  |
Gross unrecognized tax benefits, including interest and penalties | $ 78.9 |  | 78.9 |  | $ 66.5
Decrease in unrecognized tax benefits | $ 42.4 |  | $ 42.4 |  |
Minimum |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Expected annual effective income tax rate (as percent) |  |  | 26.00% |  |
Maximum |  |  |  |  |
Income Tax [Line Items] |  |  |  |  |
Expected annual effective income tax rate (as percent) |  |  | 27.00% |  |

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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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