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Summary of Significant Accounting Policies - Income Taxes (Details) $ in Millions | 9 Months Ended
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Sep. 30, 2021 USD ($)
Accounting Policies [Abstract] |
Total amount of unrecognized tax benefits relating to uncertain tax positions | $ 40.6
Increase (decrease) in the total amount of unrecognized tax benefits relating to uncertain tax positions | 7.4
Increase in reserves for uncertain tax positions expected to be taken in current year | 5.0
Increase in reserves from uncertain tax positions from changes in prior year positions | 2.4
Reasonably possible reduction to the balance of unrecognized tax benefits in succeeding 12 months | $ 13.3

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