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Debt (Details 3) - Revolving Loans - USD ($)
$ in Millions
Jun. 30, 2015
Dec. 31, 2014
May. 31, 2011
Revolving loans      
Total Amount Committed by Lenders $ 468.5    
Outstanding Borrowings 122.5    
Outstanding Letters of Credit 137.1 $ 150.3  
Total Amount Available $ 208.9    
US Dollar revolving loans under the Amended Credit Agreement      
Revolving loans      
Weighted Average Interest Rate (as a percent) 1.30%    
Total Amount Committed by Lenders $ 250.0   $ 250.0
Outstanding Borrowings 122.5    
Outstanding Letters of Credit 2.7    
Total Amount Available 124.8    
Other revolving lines of credit      
Revolving loans      
Total Amount Committed by Lenders 218.5    
Outstanding Letters of Credit 134.4    
Total Amount Available $ 84.1