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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2018	Sep. 30, 2017	Sep. 30, 2018	Sep. 30, 2017
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	$ (3.7)	$ (3.4)	$ 6.7	$ (13.3)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(2.7)	(0.6)	(17.5)	(2.7)
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			21.3	31.0
Restructuring charges			10.8	16.0
Payments made			(18.8)	(26.1)
Restructuring reserve, ending balance	13.3	20.9	13.3	20.9
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			14.2	19.7
Restructuring charges			9.8	10.6
Payments made			(16.1)	(19.0)
Restructuring reserve, ending balance	7.9	11.3	7.9	11.3
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			5.7	5.5
Restructuring charges			0.2	0.7
Payments made			(0.5)	(0.6)
Restructuring reserve, ending balance	5.4	5.6	5.4	5.6
Other Restructuring [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			1.4	5.8
Restructuring charges			0.8	4.7
Payments made			(2.2)	(6.5)
Restructuring reserve, ending balance	$ 0.0	$ 4.0	$ 0.0	$ 4.0

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Amount of increase (decrease) in the value of a contingent consideration liability, including, but not limited to, differences arising upon settlement.

+ References

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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.

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