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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended								12 Months Ended
	Dec. 31, 2019	Sep. 30, 2019	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017
Restructuring Cost and Reserve [Line Items]
Document Period End Date									Dec. 31, 2019
Restructuring and acquisition charges	$ 70.1	$ 70.0	$ 25.7	$ 18.6	$ 45.5	$ 3.7	$ (11.1)	$ 0.7	$ 184.4	$ 38.8	$ 30.7
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability									(28.4)	(7.4)	(1.9)
Share-based Payment Arrangement, Noncash Expense									28.0
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				15.1				21.3	15.1	21.3	31.0
Accruals									128.0	31.4	28.8
Payments made									(106.6)	(37.6)	(38.5)
Restructuring reserve, ending balance	36.5				15.1				36.5	15.1	21.3
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				14.0				14.2	14.0	14.2	19.7
Accruals									31.1	25.5	21.6
Payments made									(20.8)	(25.7)	(27.1)
Restructuring reserve, ending balance	24.3				14.0				24.3	14.0	14.2
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				0.6				5.7	0.6	5.7	5.5
Accruals									11.1	0.7	1.3
Payments made									(3.3)	(5.8)	(1.1)
Restructuring reserve, ending balance	8.4				0.6				8.4	0.6	5.7
Other Restructuring and Acquisition Costs [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance				$ 0.5				$ 1.4	0.5	1.4	5.8
Accruals									85.8	5.2	5.9
Payments made									(82.5)	(6.1)	(10.3)
Restructuring reserve, ending balance	$ 3.8				$ 0.5				3.8	$ 0.5	$ 1.4
HFF Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Integration Related Costs									115.1
Restructuring reserve [Roll Forward]
Share-based Payment Arrangement, Expense									$ 100.0

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