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Special Charges (Schedule of Restructuring and Related Costs)(Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2017	Dec. 31, 2016
Restructuring liability				$ 5.5				$ 8.7	$ 5.5	$ 8.7
Termination benefit costs									3.5	0.4
Payments for one-time termination benefits									(2.5)	(3.6)
Restructuring liability	$ 6.5				$ 5.5				6.5	5.5
Special charges for workforce reductions	2.4	$ 2.4	$ 2.3	2.4	0.2	$ 0.6	$ 0.6	0.0	9.5	1.4
Contract Termination [Member]
Restructuring liability				5.4				8.4	5.4	8.4
Termination benefit costs									1.1	0.1
Payments for one-time termination benefits									(0.8)	(3.1)
Restructuring liability	5.7				5.4				5.7	5.4
Other Restructuring [Member]
Restructuring liability				$ 0.1				$ 0.3	0.1	0.3
Termination benefit costs									2.4	0.3
Payments for one-time termination benefits									(1.7)	(0.5)
Restructuring liability	$ 0.8				$ 0.1				$ 0.8	$ 0.1

X

- Definition

Amount of cash payments made as the result of exit or disposal activities. Excludes payments associated with a discontinued operation or an asset retirement obligation.

+ References

Reference 1: http://www.xbrl.org/2003/role/presentationRef
-Publisher FASB
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