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Debt - Maturing within One Year (Details) - USD ($)
$ in Millions
Sep. 30, 2018
Dec. 31, 2017
Short-term Debt [Line Items]    
Short-term foreign debt $ 65.8 $ 91.4
Total short-term debt 65.8 91.4
Current portion of long-term debt 83.6 101.2
Total short-term debt and current portion of long-term debt $ 149.4 $ 192.6
Short-term foreign debt    
Short-term Debt [Line Items]    
Average interest rate 7.40%