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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 3 Months Ended | 12 Months Ended
--- | --- | ---
Dec. 31, 2018 | Sep. 30, 2018 | Jun. 30, 2018 | Mar. 31, 2018 | Dec. 31, 2017 | Sep. 30, 2017 | [1] | Jun. 30, 2017 | [1] | Mar. 31, 2017 | [1] | Dec. 31, 2018 | Dec. 31, 2017 | Dec. 31, 2016
Income tax benefit (provision) | $ 54.0 | $ 133.0 | $ 126.0 | $ 124.0 | $ 1,978.0 | [1] | $ 89.0 | $ 153.0 | $ (66.0) | $ 437.0 | $ 2,154.0 | [1] | $ (3.0)
Provisional tax included in income tax expense from normal operations |  |  |  |  |  |  |  |  |  | 412.0 |  |  |
Provisional tax included in income tax expense from change in tax rate |  |  |  |  |  |  |  |  |  | 25.0 |  |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Change in Tax Rate, Deferred Tax Asset, Provisional Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  | 347.0 |  |
Tax Cuts and Jobs Act of 2017, Incomplete Accounting, Transition Tax for Accumulated Foreign Earnings, Provisional Income Tax Expense (Benefit) |  |  |  |  |  |  |  |  |  |  | 1,100.0 |  |
Reduction of tax benefit due to foreign exchange losses and translation adjustments |  |  |  |  |  |  |  |  |  |  | 35.0 |  |
Tax Cuts And Jobs Act Of 2017 Global Intangible Low-Taxed Income Provisional Tax (GILTI tax) |  |  |  |  |  |  |  |  |  | 55.0 |  |  |
Tax Cuts And Jobs Act Of 2017 Foreign Derived Intangible Income Provisional Tax (FDII benefit) |  |  |  |  |  |  |  |  |  | 10.0 |  |  |
Tax Cuts And Jobs Act Of 2017 Provisional Tax From Truing Up Toll Charge |  |  |  |  |  |  |  |  |  | 20.0 |  |  |
Tax Cuts and Jobs Act of 2017, Net Operating Loss Carryforward | 35.0 |  |  |  |  |  |  |  |  | $ 35.0 |  |  |
Tax Cuts and Jobs Act of 2017, Net Operating Loss Carryback, Period |  |  |  |  |  |  |  |  |  | 2 years |  |  |
Tax Cuts and Jobs Act of 2017, Net Operating Loss Carryforward, Period |  |  |  |  |  |  |  |  |  | 20 years |  |  |
Tax Cuts and Jobs Act of 2017, Foreign Tax Credit Carryforward | 22.0 |  |  |  |  |  |  |  |  | $ 22.0 |  |  |
Deferred tax assets valuation allowance | 317.0 |  |  |  | 456.0 |  |  |  |  | 317.0 | 456.0 |  |
Unrecognized tax benefits that would impact effective tax rate | 263.0 |  |  |  | 97.0 |  |  |  |  | $ 263.0 | $ 97.0 |  | $ 92.0
Percentage of U.S. Subsidiaries Join in Filing of Consolidated United States Federal Income Tax Returns |  |  |  |  |  |  |  |  |  | 80.00% |  |  |
Statutory U.S. income tax rate |  |  |  |  |  |  |  |  |  | 21.00% | 35.00% |  | 35.00%
Undistributed earnings of foreign subsidiaries | 1,500.0 |  |  |  | $ 15,400.0 |  |  |  |  | $ 1,500.0 | $ 15,400.0 |  |
Unremitted foreign earnings, percent |  |  |  |  |  |  |  |  |  |  | 94.00% |  |
Historic foreign earnings to be indefinitely reinvested, percent |  |  |  |  |  |  |  |  |  |  | 6.00% |  |
Foreign earnings repatriated |  |  |  |  |  |  |  |  |  | 4,200.0 |  |  |
Additional income tax as result of agreement with IRS |  |  |  | 172.0 |  |  |  |  |  |  |  |  |
Interest expense, net of tax benefit |  |  |  | $ 12.0 |  |  |  |  |  |  |  |  |
National Tax Service of Korea [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Income tax expected refund as result of agreement with tax authority | $ 425.0 |  |  |  |  |  |  |  |  | $ 425.0 |  |  |
Foreign Tax Authority [Member] | National Tax Agency, Japan [Member] | Tax Year 2011 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  |  | 2011 |  |  |
Foreign Tax Authority [Member] | National Tax Administration of Taiwan [Member] | Tax Year 2012 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  |  | 2012 |  |  |
Foreign Tax Authority [Member] | National Tax Service of Korea [Member] | Tax Year 2012 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Open tax year |  |  |  |  |  |  |  |  |  | 2012 |  |  |
Minimum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
US Statutes of Limitations Period |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Foreign Statutes of Limitations Period |  |  |  |  |  |  |  |  |  | 3 years |  |  |
Maximum [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
US Statutes of Limitations Period |  |  |  |  |  |  |  |  |  | 5 years |  |  |
Foreign Statutes of Limitations Period |  |  |  |  |  |  |  |  |  | 10 years |  |  |
Accounting Standards Update 2016-16 [Member] |  |  |  |  |  |  |  |  |  |  |  |  |
Cumulative tax benefits in beginning retained earnings |  |  |  |  |  |  |  |  |  | $ 5.0 |  |  |
[1] | In December 2017, the U.S. enacted the 2017 Tax Act which resulted in significant changes to our provision for income taxes during the fourth quarter of 2017. Refer to Note 4 (Income Taxes) to the Consolidated Financial Statements for additional information.

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