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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended |
--- | --- | ---
Mar. 31, 2017 | Mar. 31, 2016 | Dec. 31, 2016
Income Tax Disclosure [Abstract] |  |  |
Effective income tax rate (as percent) | 33.60% | 39.80% |
U.S. Federal statutory rate (as percent) | 35.00% |  |
Gross unrecognized tax benefits, including interest and penalties | $ 36.7 |  | $ 44.0
Minimum |  |  |
Income Tax [Line Items] |  |  |
Expected annual effective income tax rate (as percent) | 36.00% |  |
Maximum |  |  |
Income Tax [Line Items] |  |  |
Expected annual effective income tax rate (as percent) | 37.00% |  |

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- Definition Percentage of current income tax expense (benefit) and deferred income tax expense (benefit) pertaining to continuing operations. + References Reference 1: 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=65882285&loc=d3e32698-109319 Reference 2: 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)(2)) -URI http://asc.fasb.org/extlink&oid=26873400&loc=d3e23780-122690 Reference 3: 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=65882285&loc=d3e32687-109319 + Details
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