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Special Charges Special Charges (Narrative) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Special charges for workforce reductions and advisory costs	$ 0.6	$ 2.4	$ 1.5	$ 7.1
Termination benefit costs			1.4
Other restructuring costs			0.1	$ 5.0
Contract Termination [Member]
Termination benefit costs			0.1
Restructuring liability, current	$ 3.2		$ 3.2

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