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Income Taxes Schedule of Effective Income Tax Rate Reconciliation (Tables) | 12 Months Ended
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Dec. 31, 2019
Income Tax Disclosure [Abstract] |
Schedule of Effective Income Tax Rate Reconciliation [Table Text Block] | A reconciliation of the effective income tax rate as reflected in our Consolidated Statements of Operations to the U.S. federal statutory income tax rate is listed below.
| Years ended December 31,
| 2020 |  | 2019 |  | 2018
U.S. federal statutory income tax rate | 21.0 | % |  | 21.0 | % |  | 21.0 | %
Income tax provision at U.S. federal statutory rate | $ | 75.9 |  |  | $ | 184.5 |  |  | $ | 176.0 |
State and local income taxes, net of U.S. federal income tax benefit | 9.4 |  |  | 14.0 |  |  | 23.8 |
Impact of foreign operations, including withholding taxes | 49.9 |  |  | 34.2 |  |  | 50.7 |
U.S. tax incentives | (23.6) |  |  | (21.4) |  |  | (17.5) |
Change in net valuation allowance 1 | (1.3) |  |  | (26.3) |  |  | (16.9) |
Divestitures | 8.6 |  |  | 9.6 |  |  | 11.7 |
U.S. federal tax credits | (1.7) |  |  | 0.4 |  |  | (48.1) |
Increase in unrecognized tax benefits | 30.8 |  |  | 14.1 |  |  | 8.4 |
Net impact of the Tax Act | 0.0 |  |  | 0.0 |  |  | 13.4 |
Settlement of income tax audit | (136.2) |  |  | 0.0 |  |  | 0.0 |
Other | (3.8) |  |  | (4.3) |  |  | (2.3) |
Provision for income taxes | $ | 8.0 |  |  | $ | 204.8 |  |  | $ | 199.2 |
Effective income tax rate on operations | 2.2 | % |  | 23.3 | % |  | 23.8 | %
1 Reflects changes in valuation allowances that impacted the effective income tax rate for each year presented.

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- Definition Tabular disclosure of the reconciliation using percentage or dollar amounts of the reported amount of income tax expense attributable to continuing operations for the year to the amount of income tax expense that would result from applying domestic federal statutory tax rates to pretax income from continuing operations. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 740 -SubTopic 10 -Section 50 -Paragraph 12 -URI http://asc.fasb.org/extlink&oid=84230637&loc=d3e32687-109319 + Details
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