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Restructuring and Acquisition Charges (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	Dec. 31, 2015
Restructuring Cost and Reserve [Line Items]
Restructuring and acquisition charges	$ 17.4	$ 3.4	$ 5.4	$ 4.5	$ 32.6	$ 18.0	$ 10.3	$ 7.6	$ 30.7	$ 68.5	$ 34.1
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)										6.5
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability									(1.9)	(13.5)	(2.4)
Business Combination, Indemnification Assets										6.5	12.8
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				31.0				8.6	31.0	8.6	7.6
Accruals									28.8	48.5	18.9
Payments made									(38.5)	(26.1)	(17.9)
Restructuring reserve, ending balance	21.3				31.0				21.3	31.0	8.6
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				19.7				2.7	19.7	2.7	3.0
Accruals									21.6	28.0	1.7
Payments made									(27.1)	(11.0)	(2.0)
Restructuring reserve, ending balance	14.2				19.7				14.2	19.7	2.7
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				5.5				5.7	5.5	5.7	4.2
Accruals									1.3	0.3	1.6
Payments made									(1.1)	(0.5)	(0.1)
Restructuring reserve, ending balance	5.7				5.5				5.7	5.5	5.7
Other Acquisition Costs [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				$ 5.8				$ 0.2	5.8	0.2	0.4
Accruals									5.9	20.2	15.6
Payments made									(10.3)	(14.6)	(15.8)
Restructuring reserve, ending balance	$ 1.4				$ 5.8				$ 1.4	$ 5.8	$ 0.2

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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.

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Amount of impairment loss resulting from write-down of assets, excluding financial assets and goodwill, lacking physical substance and having a projected indefinite period of benefit to fair value.

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