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Special Charges (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2020
Mar. 31, 2019
Special charges for workforce reductions and advisory costs $ (0.1) $ (0.1)
Termination benefit costs (0.1)  
Restructuring cost, settled without cash 0.1 $ 0.1
Restructuring liability, current 0.2  
Contract Termination [Member]    
Termination benefit costs $ 0.0