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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2016	Sep. 30, 2016	Jun. 30, 2016	Mar. 31, 2016	Dec. 31, 2015	Sep. 30, 2015	Jun. 30, 2015	Mar. 31, 2015	Dec. 31, 2016	Dec. 31, 2015	Dec. 31, 2014
Restructuring Cost and Reserve [Line Items]
Restructuring and acquisition charges	$ 32.6	$ 18.0	$ 10.3	$ 7.6	$ 13.4	$ 18.1	$ 1.8	$ 0.8	$ 68.5	$ 34.1	$ 42.5
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)									6.5
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability									(13.5)	(2.4)	(3.9)
Business Combination, Indemnification Assets										12.8	34.5
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				8.6				7.6	8.6	7.6	10.5
Accruals									48.5	18.9	11.9
Payments made									(26.1)	(17.9)	(14.8)
Restructuring reserve, ending balance	31.0				8.6				31.0	8.6	7.6
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				2.7				3.0	2.7	3.0	3.8
Accruals									28.0	1.7	5.2
Payments made									(11.0)	(2.0)	(6.0)
Restructuring reserve, ending balance	19.7				2.7				19.7	2.7	3.0
Retention Bonuses [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				0.0				0.0	0.0	0.0	0.4
Accruals									0.0	0.0	0.0
Payments made									0.0	0.0	(0.4)
Restructuring reserve, ending balance	0.0				0.0				0.0	0.0	0.0
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				5.7				4.2	5.7	4.2	5.9
Accruals									0.3	1.6	3.2
Payments made									(0.5)	(0.1)	(4.9)
Restructuring reserve, ending balance	5.5				5.7				5.5	5.7	4.2
Other Acquisition Costs [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				$ 0.2				$ 0.4	0.2	0.4	0.4
Accruals									20.2	15.6	3.5
Payments made									(14.6)	(15.8)	(3.5)
Restructuring reserve, ending balance	$ 5.8				$ 0.2				5.8	$ 0.2	$ 0.4
LaSalle [Member]
Restructuring Cost and Reserve [Line Items]
Impairment of Intangible Assets, Indefinite-lived (Excluding Goodwill)									$ 6.5

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