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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 9 Months Ended
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Sep. 30, 2019 | Sep. 30, 2018 | Sep. 30, 2019 | Sep. 30, 2018
Accounting Policies [Abstract] |  |  |  |
Excess tax benefit | $ 4.5 | $ 3.3 | $ 21.1 | $ 13.9

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