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Income Taxes Change in Unrecognized Tax Benefits (Details) $ in Millions | 3 Months Ended | 9 Months Ended
--- | --- | ---
Sep. 30, 2018 USD ($) | Sep. 30, 2018 USD ($)
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Gross Unrecognized Tax Benefits | $ 342.5 | $ 342.5
Unrecognized Tax Benefits that Would Impact Effective Tax Rate | 317.2 | 317.2
Unrecognized Tax Benefits, Decrease Resulting from Current Period Tax Positions | 36.6 | 70.5
Minimum [Member] |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Decrease in unrecognized tax benefits is reasonably possible | 30.0 | 30.0
Maximum [Member] |  |
Significant Change in Unrecognized Tax Benefits is Reasonably Possible [Line Items] |  |
Decrease in unrecognized tax benefits is reasonably possible | $ 40.0 | $ 40.0

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