Debt - Revolving Loan Arrangements (Details) $ in Millions	Sep. 30, 2020 USD ($)
Revolving lines of credit
Total Amount Committed by Lenders	$ 741.6
Total Amount Uncommitted by Lenders	115.4
Outstanding Letters of Credit	141.8
Total Committed and Uncommitted Amount Available	$ 715.2
2019 Credit Agreement | US Dollar revolving loan
Revolving lines of credit
Weighted Average Interest Rate (as a percent)	1.30%
Total Amount Committed by Lenders	$ 600.0
Outstanding Letters of Credit	0.2
Total Committed and Uncommitted Amount Available	$ 599.8
Bank guarantees and working capital line
Revolving lines of credit
Weighted Average Interest Rate (as a percent)	0.00%
Total Amount Committed by Lenders	$ 141.6
Total Amount Uncommitted by Lenders	115.4
Outstanding Letters of Credit	141.6
Total Committed and Uncommitted Amount Available	$ 115.4