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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2018	Jun. 30, 2017	Jun. 30, 2018	Jun. 30, 2017
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	$ 11.1	$ (5.4)	$ 10.4	$ (9.9)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(13.6)	0.7	(14.8)	(2.1)
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			21.3	31.0
Restructuring charges			4.4	12.0
Payments made			(12.4)	(21.4)
Restructuring reserve, ending balance	13.3	21.6	13.3	21.6
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			14.2	19.7
Restructuring charges			3.7	6.4
Payments made			(10.0)	(15.3)
Restructuring reserve, ending balance	7.9	10.8	7.9	10.8
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			5.7	5.5
Restructuring charges			0.2	1.3
Payments made			(0.5)	(0.4)
Restructuring reserve, ending balance	5.4	6.4	5.4	6.4
Other Acquisition Costs [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			1.4	5.8
Restructuring charges			0.5	4.3
Payments made			(1.9)	(5.7)
Restructuring reserve, ending balance	$ 0.0	$ 4.4	$ 0.0	$ 4.4

X

- Definition

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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-Publisher FASB
-Name Accounting Standards Codification
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-SubTopic 30
-Section 50
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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.

+ References

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Amount of expenses associated with exit or disposal activities pursuant to an authorized plan. Excludes expenses related to a discontinued operation or an asset retirement obligation.

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Amount, after cash payment, of expenses associated with exit or disposal activities pursuant to an authorized plan and expenses resulting from the write-down of assets. Excludes expenses related to a business combination, a discontinued operation or an asset retirement obligation.

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Carrying amount (including both current and noncurrent portions of the accrual) as of the balance sheet date pertaining to a specified type of cost associated with exit from or disposal of business activities or restructuring pursuant to a duly authorized plan.

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