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Certain Balance Sheet Components Narrative (Details) - Subsequent Event [Member]
$ in Millions
3 Months Ended
Jun. 30, 2019
USD ($)
Massy [Member]  
Property, Plant and Equipment [Line Items]  
Gain (Loss) on Sale of Properties $ 1.5
Stretford [Member]  
Property, Plant and Equipment [Line Items]  
Gain (Loss) on Sale of Properties $ 5.0