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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Restructuring Cost and Reserve [Line Items]
Restructuring and acquisition charges	$ 142.4	$ 184.4	$ 38.8
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	(14.8)	28.4	7.4
Share-based Payment Arrangement, Noncash Expense	36.7	28.0	0.0
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	36.5	15.1	21.3
Accruals	120.5	128.0	31.4
Payments made	(112.0)	(106.6)	(37.6)
Restructuring reserve, ending balance	45.0	36.5	15.1
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	24.3	14.0	14.2
Accruals	69.0	31.1	25.5
Payments made	(52.0)	(20.8)	(25.7)
Restructuring reserve, ending balance	41.3	24.3	14.0
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	8.4	0.6	5.7
Accruals	25.0	11.1	0.7
Payments made	(30.9)	(3.3)	(5.8)
Restructuring reserve, ending balance	2.5	8.4	0.6
Other Restructuring and Acquisition Costs [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance	3.8	0.5	1.4
Accruals	26.5	85.8	5.2
Payments made	(29.1)	(82.5)	(6.1)
Restructuring reserve, ending balance	1.2	3.8	0.5
JLLContract Terminationand Other Charges Member
Restructuring reserve [Roll Forward]
Accruals	51.5	96.9	$ 5.9
HFF Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Integration Related Costs	75.9	$ 115.1
Restructuring reserve [Roll Forward]
Share-based Payment Arrangement, Expense	$ 100.0

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