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Income Taxes Effective tax rate (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
--- | --- | ---
Jun. 30, 2020 | Jun. 30, 2019 | Jun. 30, 2020 | Jun. 30, 2019
Income Tax Disclosure [Abstract] |  |  |  |
Effective Income Tax Rate | 9.00% | 17.00% | 13.00% | 12.00%
Effective Income Tax Rate Reconciliation, at Federal Statutory Income Tax Rate, Percent |  |  | 21.00% | 21.00%
Share-based Payment Arrangement, Expense, Tax Benefit | $ 3.0 | $ 1.8 | $ 3.5 | $ 7.4
Discretetaxbenefitcontingentconsiderationrevaluation |  | $ 9.5 |  | $ 11.3

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