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Debt - Maturing within One Year (Details) - USD ($)
$ in Millions
Sep. 30, 2017
Dec. 31, 2016
Short-term Debt [Line Items]    
Short-term foreign debt $ 100.1 $ 85.5
Commercial paper 8.4 6.3
Total short-term debt 108.5 91.8
Current portion of long-term debt 105.7 2.4
Short-term debt and current portion of long-term debt $ 214.2 $ 94.2
Short-term foreign debt    
Short-term Debt [Line Items]    
Average interest rate 8.40%  
Commercial paper    
Short-term Debt [Line Items]    
Average interest rate 1.50%