Debt - Revolving Loan Arrangements (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 11, 2019
Revolving lines of credit
Total Amount Committed by Lenders	$ 851.8
Outstanding Letters of Credit	143.2
Total Amount Available	708.6
2019 Credit Agreement
Revolving lines of credit
Total Amount Committed by Lenders	600.0	$ 600.0
2019 Credit Agreement | US Dollar revolving loan
Revolving lines of credit
Total Amount Committed by Lenders	600.0
Outstanding Letters of Credit	0.2
Total Amount Available	599.8
Other revolving loans
Revolving lines of credit
Total Amount Committed by Lenders	251.8
Outstanding Letters of Credit	143.0
Total Amount Available	$ 108.8