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Income Taxes | 6 Months Ended
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Jun. 30, 2019
Income Taxes | Note 14—Income Taxes ​
​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​ | ​
​ |  | Three Months Ended June 30, |  | Six Months Ended June 30, | ​
​ | ​ | 2019 | ​ | 2018 | ​ | 2019 | ​ | 2018 | ​
Provision for income taxes | ​ | $ | (78.7) | ​ | $ | (94.5) | ​ | $ | (158.3) | ​ | $ | (180.9) | ​
Effective tax rate | ​ |  | 21.3 | % |  | 24.7 | % |  | 22.0 | % |  | 24.5 | %
​ For the three months ended June 30, 2019 and 2018, stock option exercise activity had the impact of lowering our Provision for income taxes by approximately $12.9 and $3.0, respectively, and lowering our effective tax rate by approximately 350 basis points and 80 basis points, respectively, due to the recognition of excess tax benefits within Provision for income taxes in the accompanying Condensed Consolidated Statements of Income. For the six months ended June 30, 2019 and 2018, stock option exercise activity had the impact of lowering our Provision for income taxes by approximately $19.7 and $7.1, respectively, and lowering our effective tax rate by approximately 270 basis points and 100 basis points, respectively. ​ On December 22, 2017, the United States federal government enacted the Tax Cuts and Jobs Act (“Tax Act”), marking a change from a worldwide tax system to a modified territorial tax system in the United States. As part of this change, the Tax Act, among other changes, provides for a transition tax on the accumulated unremitted foreign earnings and profits of the Company’s foreign subsidiaries (“Transition Tax”) and a reduction of the U.S. federal corporate income tax rate from 35% to 21%. The Company finalized its accounting of the Tax Act in the fourth quarter of 2018. The Company paid its second annual installment of the Transition Tax, net of applicable tax credits and deductions, in the second quarter of 2019, and will pay the balance of the Transition Tax over the remainder of the eight-year period ending 2025, as permitted under the Tax Act. The current and long-term portions of the Transition Tax are recorded in Accrued income taxes and Other long-term liabilities, respectively, on the Condensed Consolidated Balance Sheets as of June 30, 2019 and December 31, 2018. ​ The Company operates in the U.S. and numerous foreign taxable jurisdictions, and at any point in time has numerous audits underway at various stages of completion. With few exceptions, the Company is subject to income tax examinations by tax authorities for the years 2014 and after. The Company is generally not able to precisely estimate the ultimate settlement amounts or timing until the close of an audit. The Company evaluates its tax positions and establishes liabilities for uncertain tax positions that may be challenged by tax authorities and may not be fully sustained, despite the Company’s belief that the underlying tax positions are fully supportable. As of June 30, 2019, the amount of the liability for unrecognized tax benefits, including penalties and interest, which if recognized would impact the effective tax rate, was approximately $140.3, which is included in Other long-term liabilities in the accompanying Condensed Consolidated Balance Sheets. Unrecognized tax benefits are reviewed on an ongoing basis and are adjusted for changing facts and circumstances, including progress of tax audits and the closing of statutes of limitation. Based on information currently available, management anticipates that over the next twelve-month period, audit activity could be completed and statutes of limitation may close relating to existing unrecognized tax benefits of approximately $41.8.

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- Definition The entire disclosure for income taxes. Disclosures may include net deferred tax liability or asset recognized in an enterprise's statement of financial position, net change during the year in the total valuation allowance, approximate tax effect of each type of temporary difference and carryforward that gives rise to a significant portion of deferred tax liabilities and deferred tax assets, utilization of a tax carryback, and tax uncertainties information. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -URI http://asc.fasb.org/topic&trid=2144680 + Details
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