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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended		6 Months Ended
	Jun. 30, 2020	Jun. 30, 2019	Jun. 30, 2020	Jun. 30, 2019
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	$ (28.2)	$ (25.7)	$ (42.3)	$ (44.3)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0.6	14.3	(7.6)	20.0
Share-based Payment Arrangement, Noncash Expense	13.0	0.0	24.2	0.0
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			36.5	15.1
Restructuring charges			25.7	24.3
Payments made			(43.5)	(24.8)
Restructuring reserve, ending balance	18.7	14.6	$ 18.7	14.6
Document Period End Date			Jun. 30, 2020
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 24.3	14.0
Restructuring charges	7.0	5.4	8.3	10.4
Payments made			(16.0)	(14.8)
Restructuring reserve, ending balance	16.6	9.6	16.6	9.6
Contract Termination [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			8.4	0.6
Restructuring charges			6.7	1.0
Payments made			(13.5)	(1.1)
Restructuring reserve, ending balance	1.6	0.5	1.6	0.5
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring charges	7.6	6.0	17.4	13.9
Other Restructuring [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			3.8	0.5
Restructuring charges			10.7	12.9
Payments made			(14.0)	(8.9)
Restructuring reserve, ending balance	0.5	4.5	0.5	4.5
HFF Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Integration Related Costs	$ 20.1	$ 3.2	41.4	$ 9.7
Restructuring reserve [Roll Forward]
Expense to be recognized for retention awards			$ 100.0

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