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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	$ (33.5)	$ (70.0)	$ (75.8)	$ (114.3)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(0.6)	0.7	(8.2)	20.7
Share-based Payment Arrangement, Noncash Expense	6.2	14.0	30.5	14.0
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			36.5	15.1
Restructuring charges			53.5	79.6
Payments made			(58.5)	(77.5)
Restructuring reserve, ending balance	31.5	17.2	$ 31.5	17.2
Document Period End Date			Sep. 30, 2020
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 24.3	14.0
Restructuring charges	19.3	7.2	27.6	17.6
Payments made			(22.1)	(21.2)
Restructuring reserve, ending balance	29.8	10.4	29.8	10.4
Contract Termination [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			8.4	0.6
Restructuring charges			9.3	5.8
Payments made			(16.0)	(1.5)
Restructuring reserve, ending balance	1.7	4.9	1.7	4.9
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring charges	8.6	48.1	25.9	62.0
Other Restructuring [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			3.8	0.5
Restructuring charges			16.6	56.2
Payments made			(20.4)	(54.8)
Restructuring reserve, ending balance	0.0	1.9	0.0	1.9
HFF Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Integration Related Costs	$ 13.8	$ 60.1	55.2	$ 69.8
Restructuring reserve [Roll Forward]
Expense to be recognized for retention awards			$ 100.0

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