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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Mar. 31, 2017	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Restructuring Cost and Reserve [Line Items]
Restructuring and acquisition charges	$ 45.5	$ 3.7	$ 11.1	$ 0.7	$ 17.4	$ 3.4	$ 5.4	$ 4.5	$ 38.8	$ 30.7	$ 68.5
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)											6.5
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability									(7.4)	(1.9)	(13.5)
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				21.3				31.0	21.3	31.0	8.6
Accruals									31.4	28.8	48.5
Payments made									(37.6)	(38.5)	(26.1)
Restructuring reserve, ending balance	15.1				21.3				15.1	21.3	31.0
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				14.2				19.7	14.2	19.7	2.7
Accruals									25.5	21.6	28.0
Payments made									(25.7)	(27.1)	(11.0)
Restructuring reserve, ending balance	14.0				14.2				14.0	14.2	19.7
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				5.7				5.5	5.7	5.5	5.7
Accruals									0.7	1.3	0.3
Payments made									(5.8)	(1.1)	(0.5)
Restructuring reserve, ending balance	0.6				5.7				0.6	5.7	5.5
Other Restructuring and Acquisition Costs [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				$ 1.4				$ 5.8	1.4	5.8	0.2
Accruals									5.2	5.9	20.2
Payments made									(6.1)	(10.3)	(14.6)
Restructuring reserve, ending balance	$ 0.5				$ 1.4				$ 0.5	$ 1.4	$ 5.8

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