Commitments and Contingencies - Letters of Credit and Guarantees (Details) - USD ($) $ in Millions	Dec. 31, 2020	Dec. 31, 2019
Letters of Credit and Guarantees
Bank guarantees primarily for customer advances		$ 133.0
Revolving Loans
Letters of Credit and Guarantees
Bank guarantees primarily for customer advances	$ 133.0	$ 143.2

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