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Summary of Significant Accounting Policies - Income Taxes (Details) $ in Millions | 3 Months Ended
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Mar. 31, 2020 USD ($)
Accounting Policies [Abstract] |
Total amount of unrecognized tax benefits relating to uncertain tax positions | $ 40.3
Decrease in the total amount of unrecognized tax benefits relating to uncertain tax positions | (0.6)
Decrease resulted primarily from a favorable settlements related to certain non-U.S. income tax obligations of an acquired business and the expiration of U.S. state income tax statutes | 1.7
Increase in reserves for uncertain tax positions expected to be taken in current year | 1.1
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | $ 6.8

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