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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2021	Sep. 30, 2020	Sep. 30, 2021	Sep. 30, 2020
Restructuring and Related Activities [Abstract]
Restructuring and acquisition charges	$ (15.6)	$ (33.5)	$ (50.9)	$ (75.8)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability	0.0	(0.6)	1.0	(8.2)
Share-based Payment Arrangement, Noncash Expense	3.2	6.2	15.2	30.5
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			45.0	36.5
Restructuring charges			34.7	53.5
Payments made			(58.3)	(58.5)
Restructuring reserve, ending balance	21.4	31.5	$ 21.4	31.5
Document Period End Date			Sep. 30, 2021
Severance [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			$ 41.3	24.3
Restructuring charges	1.2	19.3	2.1	27.6
Payments made			(29.0)	(22.1)
Restructuring reserve, ending balance	14.4	29.8	14.4	29.8
Contract Termination [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			2.5	8.4
Restructuring charges			7.7	9.3
Payments made			(9.4)	(16.0)
Restructuring reserve, ending balance	0.8	1.7	0.8	1.7
Lease Exit [Member]
Restructuring reserve [Roll Forward]
Restructuring charges	11.2	8.6	32.6	25.9
Other Restructuring [Member]
Restructuring reserve [Roll Forward]
Restructuring reserve, beginning balance			1.2	3.8
Restructuring charges			24.9	16.6
Payments made			(19.9)	(20.4)
Restructuring reserve, ending balance	6.2	0.0	6.2	0.0
HFF Acquisition [Member]
Restructuring Cost and Reserve [Line Items]
Business Combination, Integration Related Costs	$ 6.6	$ 13.8	$ 30.5	$ 55.2

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