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Debt (Details) - USD ($)
$ in Millions
Sep. 30, 2015
Dec. 31, 2014
Notes payable    
Uncommitted lines of credit $ 68.4 $ 24.8
Term loan 11.5 0.0
Other 1.0 0.8
Short-term Debt 80.9 25.6
Long-term debt    
Revolving credit facility 171.1 240.0
Senior notes 225.0 225.0
Term loan 215.6 0.0
Industrial development revenue bonds 4.4 11.9
Other 2.2 2.9
Long-term debt $ 618.3 $ 479.8