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Contingencies (Narrative) (Details) - USD ($)
$ in Millions
1 Months Ended
Aug. 31, 2018
Jan. 31, 2018
Mar. 31, 2019
Commitments and Contingencies Disclosure [Abstract]      
Loss Contingency, Damages Sought, Value $ 2.8 $ 10.0  
Letters of Credit Outstanding, Amount     $ 128.0