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Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2017 | Jun. 30, 2016 | Jun. 30, 2017 | Jun. 30, 2016
Income Taxes |  |  |  |
Provision for income taxes | $ (63.6) | $ (75.3) | $ (134.6) | $ (139.2)
Effective tax rate (as a percent) | 20.10% | 26.50% | 21.90% | 27.50%
Impact of acquisition-related expenses on the effective tax rate (in basis points) |  |  |  | 1.00%
Liability for unrecognized tax benefits, including penalties and interest, which if recognized would impact the effective tax rate | $ 133.7 |  | $ 133.7 |
Unrecognized tax benefits that could change in the next twelve-month period | 5.7 |  | 5.7 |
Impact of ASU 2016-09 |  |  |  |
Income Taxes |  |  |  |
Provision for income taxes | $ 21.2 |  | $ 29.2 |
Impact of tax benefits related to stock-based compensation (in basis points) | 6.60% |  | 4.70% |

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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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