Debt - Revolving Loan Arrangements (Details) $ in Millions	Sep. 30, 2019 USD ($)
Revolving lines of credit
Total Amount Committed by Lenders	$ 736.7
Outstanding Borrowings	310.4
Outstanding Letters of Credit	127.5
Total Amount Available	$ 298.8
US Dollar revolving loan under the 2015 Credit Agreement
Revolving lines of credit
Weighted Average Interest Rate (as a percent)	2.50%
Total Amount Committed by Lenders	$ 500.0
Outstanding Borrowings	310.4
Outstanding Letters of Credit	1.1
Total Amount Available	188.5
Alicona revolving line of credit
Revolving lines of credit
Total Amount Committed by Lenders	5.3
Total Amount Available	5.3
Other revolving loans
Revolving lines of credit
Total Amount Committed by Lenders	231.4
Outstanding Letters of Credit	126.4
Total Amount Available	$ 105.0