Commitments and Contingencies - Letters of Credit and Guarantees (Details) - USD ($) $ in Millions	Sep. 30, 2020	Dec. 31, 2019
Letters of Credit and Guarantees
Bank guarantees primarily for customer advances	$ 141.8
Revolving Loans
Letters of Credit and Guarantees
Bank guarantees primarily for customer advances	$ 141.8	$ 143.2

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