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Summary of Significant Accounting Policies - Income Taxes (Details) - USD ($) $ in Millions | 3 Months Ended | 6 Months Ended
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Jun. 30, 2019 | Jun. 30, 2018 | Jun. 30, 2019 | Jun. 30, 2018
Accounting Policies [Abstract] |  |  |  |
Excess tax benefit | $ 7.8 | $ 1.5 | $ 16.6 | $ 10.6

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