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Subsequent Events (Details) - PPC - Corning
$ in Millions
1 Months Ended
Jul. 19, 2018
USD ($)
Jul. 05, 2011
patent
Mar. 31, 2018
USD ($)
Nov. 30, 2016
USD ($)
Subsequent Event [Line Items]        
Gain contingency, number of patents allegedly infringed upon | patent   2    
Litigation settlement amount     $ 61.8 $ 61.3
Subsequent Event        
Subsequent Event [Line Items]        
Proceeds from settlement $ 62.1