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GODERICH TORNADO (Details) - USD ($)
$ in Millions
3 Months Ended 41 Months Ended
Sep. 30, 2014
Dec. 31, 2014
Goderich Tornado [Abstract]    
Total insurance advances   $ 114.9
Deferred revenue released in connection with settlement $ 83.3  
Gain recorded as reduction to production cost 82.3  
Gain recorded as reduction to selling, general and administrative expenses $ 1.0