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Income Taxes (Narrative) (Details) - USD ($) $ / shares in Units, $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018 | Dec. 31, 2017
Income Taxes [Line Items] |  |  |  |
Transition tax on foreign earnings |  |  | $ 96.4 |
Foreign tax credit related to withholding taxes |  |  | 106.7 |
Change in state tax expense - remeasurement of deferred tax assets |  |  | $ 10.0 |
Transition tax, noncurrent liability | $ 66.1 |  |  |
Taxes Payable, Current | $ 7.8 |  |  |
Federal statutory rate | 21.00% | 21.00% | 21.00% | 35.00%
Federal income tax rate after enactment of Tax reform (Percentage) | 21.00% |  |  |
Effective Income Tax Rate Reconciliation, Tax Holiday, Amount |  | $ 17.3 | $ 16.9 |
foreign withholding tax |  | $ 13.1 | $ 60.7 |
Impact of tax holiday on diluted earnings per share |  | $ 0.15 | $ 0.14 |
Liability for Uncertain Tax Positions, Noncurrent | $ 23.1 |  |  |
Change in state tax expense |  |  | $ 5.6 |
State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Net operating loss carryforwards | $ 86.8 |  |  |
Foreign [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Tax credit carryforward expiration | 2028 |  |  |
Federal And State [Member] |  |  |  |
Income Taxes [Line Items] |  |  |  |
Operating Loss Carryforwards, Date | 2021 through 2034 |  |  |

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