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Income Taxes (Narrative) (Details) - USD ($) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2016 | Dec. 31, 2015 | Dec. 31, 2014 | Sep. 19, 2016 | Dec. 31, 2013
Income Taxes [Line Items] |  |  |  |  |
Reversal of valuation allowance | $ 359.8 | $ 12.1 | $ 23.3 |  |
Income tax benefit | 3.9 | (10.8) | 0.2 |  |
Reversal of reserves and interest for potential liabilities | 1.9 | 4.3 | 4.6 |  |
Reversal of prior year reinvestment assertion | 310.8 |  |  |  |
Income and withholding taxes, foreign | 43.5 | 24.4 | 19.8 |  |
New reserves and interest on existing reserves for potential liabilities, foreign | 3.5 | 4.4 | 4.6 |  |
Impact on deferred tax asset due to rate change |  | 1.6 |  |  |
Deferred federal income tax expense (benefit), tax deductible goodwill |  |  | 3.3 |  |
Balance of unrecognized tax benefit | 136.7 | 33.5 | 31.2 |  | $ 20.9
Unrecognized tax position, that would affect the annual effective tax rate | 125.5 |  |  |  |
Estimate of decrease in unrecognized tax positions | 3.8 |  |  |  |
Interest and penalties recognized | 0.5 | 0.9 | 0.5 |  |
Accrued interest and penalties | 4.4 | 3.9 | $ 3.2 |  |
Foreign [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards | 1,078.8 | 1,000.5 |  |  |
Tax credit carryforwards | 50.5 | 34.3 |  |  |
Federal [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards | 1,203.6 | 638.8 |  |  |
Tax credit carryforwards | 211.9 | 132.9 |  |  |
State [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards | 1,191.2 | 662.7 |  |  |
Tax credit carryforwards | 129.0 | $ 51.3 |  |  |
Stock Option Deductions [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Excess tax deductions not included in deferred tax assets | 194.5 |  |  |  |
Fairchild [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Increase (decrease) in income tax expense | 310.8 |  |  |  |
Reversal of valuation allowance | (267.9) |  |  |  |
Fairchild [Member] | Federal [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Capital loss carryforwards |  |  |  | $ 29.0 |
Capital loss carryforwards expired | 26.2 |  |  |  |
System Solutions Group [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Income tax benefit | 89.4 |  |  |  |
Japan [Member] | Foreign [Member] |  |  |  |  |
Income Taxes [Line Items] |  |  |  |  |
Net operating loss carryforwards | $ 287.9 |  |  |  |

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