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Income Taxes (Details) - USD ($) $ in Millions | Mar. 31, 2019 | Dec. 31, 2018
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Income Tax Disclosure [Abstract] |  |
Unrecognized income tax benefits that would affect effective tax rate | $ 165.3 | $ 166.1
Accrued or deferred taxes relating to uncertain income tax positions | 56.3 | 58.5
Accrued interest and penalties relating to unrecognized tax benefits | $ 28.3 | $ 27.2

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