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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	$ (14.1)	$ (18.6)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(8.2)	5.7
Share-based Payment Arrangement, Noncash Expense	11.2	0.0
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	36.5	15.1
Restructuring charges	11.1	12.9
Payments made	(30.8)	(14.4)
Restructuring reserve, ending balance	$ 16.8	13.6
Document Period End Date	Mar. 31, 2020
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 24.3	14.0
Restructuring charges	1.3	5.0
Payments made	(14.3)	(7.8)
Restructuring reserve, ending balance	11.3	11.2
Contract Termination [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	8.4	0.6
Restructuring charges	2.4	0.0
Payments made	(9.6)	(0.1)
Restructuring reserve, ending balance	1.2	0.5
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring charges	9.8
Other Restructuring [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	3.8	0.5
Restructuring charges	7.4	7.9
Payments made	(6.9)	(6.5)
Restructuring reserve, ending balance	4.3	1.9
HFF Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Integration Related Costs	21.3	$ 6.5
Restructuring reserve [Roll Forward]
Expense to be recognized for retention awards	$ 100.0

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