Commitments and Contingencies - Letters of Credit and Guarantees (Details) - USD ($) $ in Millions	Sep. 30, 2019	Dec. 31, 2018
Letters of Credit and Guarantees
Bank guarantees primarily for customer advances	$ 127.5
Revolving Loans
Letters of Credit and Guarantees
Bank guarantees primarily for customer advances	$ 127.5	$ 138.3

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