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Legal Matters (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Jun. 30, 2017
Loss Contingencies    
Litigation Settlement, Amount Awarded to Other Party $ 25.0  
Compensatory damages    
Loss Contingencies    
Loss Contingency, Damages Awarded, Value   $ 3.9
Punitive damages    
Loss Contingencies    
Loss Contingency, Damages Awarded, Value $ 19.0 $ 350.0