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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2021	Mar. 31, 2020
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	$ (17.2)	$ (14.1)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(0.1)	(8.2)
Share-based Payment Arrangement, Noncash Expense	6.0	11.2
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	45.0	36.5
Restructuring charges	11.3	11.1
Payments made	(29.3)	(30.8)
Restructuring reserve, ending balance	$ 27.0	16.8
Document Period End Date	Mar. 31, 2021
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	$ 41.3	24.3
Restructuring charges	1.8	1.3
Payments made	(18.9)	(14.3)
Restructuring reserve, ending balance	24.2	11.3
Contract Termination [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	2.5	8.4
Restructuring charges	3.3	2.4
Payments made	(4.8)	(9.6)
Restructuring reserve, ending balance	1.0	1.2
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring charges	9.5	9.8
Other Restructuring [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	1.2	3.8
Restructuring charges	6.2	7.4
Payments made	(5.6)	(6.9)
Restructuring reserve, ending balance	1.8	4.3
HFF Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Integration Related Costs	11.5	$ 21.3
Restructuring reserve [Roll Forward]
Expense to be recognized for retention awards	$ 100.0

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