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Special Charges Special Charges (Narrative) (Details) - USD ($)
$ in Millions
3 Months Ended
Mar. 31, 2018
Mar. 31, 2017
Termination benefit costs $ 0.7  
Other Restructuring Costs 0.1 $ 1.6
Contract Termination [Member]    
Termination benefit costs 0.0  
Restructuring liability, current 0.4  
Restructuring liability, noncurrent $ 3.4