Debt (Details 2) (USD $) In Millions, unless otherwise specified	Sep. 30, 2011	Feb. 26, 2008
Revolving Loans
Revolving loans
Total Amount Committed by Lenders	$ 432.5
Outstanding Borrowings	217.0
Outstanding Letters of Credit	106.8
Total Amount Available	108.7
US Dollar revolving loans under the Amended Credit Agreement
Revolving loans
Weighted Average Interest Rate (as a percent)	1.40%
Total Amount Committed by Lenders	250.0	230.0
Outstanding Borrowings	216.5
Outstanding Letters of Credit	0.3
Total Amount Available	33.2
Other revolving loans
Revolving loans
Weighted Average Interest Rate (as a percent)	4.60%
Total Amount Committed by Lenders	182.5
Outstanding Borrowings	0.5
Outstanding Letters of Credit	106.5
Total Amount Available	$ 75.5