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Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Debt    
Total debt $ 884.4 $ 689.9
Short-term debt 23.2 17.9
Long-term debt 861.2 672.0
Credit facility    
Debt    
Total debt 525.0 420.0
Maximum borrowing capacity 1,260.0  
Amount outstanding 525.0 420.0
Unused portion of facility 727.2 665.2
Term Loans    
Debt    
Total debt 336.2 241.3
Capital leases    
Debt    
Total debt 13.6 11.4
Other    
Debt    
Total debt 9.6 17.2
Letters of credit and bankers' acceptances    
Debt    
Maximum borrowing capacity 400.0  
Amount outstanding $ 7.8 $ 14.8