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Restructuring and Acquisition Charges (Details) - USD ($)
$ in Millions
3 Months Ended 6 Months Ended
Jun. 30, 2021
Jun. 30, 2020
Jun. 30, 2021
Jun. 30, 2020
Restructuring and Related Activities [Abstract]        
Restructuring and acquisition charges $ (18.1) $ (28.2) $ (35.3) $ (42.3)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability 1.1 0.6 1.0 (7.6)
Share-based Payment Arrangement, Noncash Expense 6.0 13.0 12.0 24.2
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     45.0 36.5
Restructuring charges     22.3 25.7
Payments made     (48.6) (43.5)
Restructuring reserve, ending balance 18.7 18.7 $ 18.7 18.7
Document Period End Date     Jun. 30, 2021  
Severance [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     $ 41.3 24.3
Restructuring charges (0.9) 7.0 0.9 8.3
Payments made     (26.4) (16.0)
Restructuring reserve, ending balance 15.8 16.6 15.8 16.6
Contract Termination [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     2.5 8.4
Restructuring charges     4.9 6.7
Payments made     (6.4) (13.5)
Restructuring reserve, ending balance 1.0 1.6 1.0 1.6
Lease Exit [Member]        
Restructuring reserve [Roll Forward]        
Restructuring charges 11.9 7.6 21.4 17.4
Other Restructuring [Member]        
Restructuring reserve [Roll Forward]        
Restructuring reserve, beginning balance     1.2 3.8
Restructuring charges     16.5 10.7
Payments made     (15.8) (14.0)
Restructuring reserve, ending balance 1.9 0.5 1.9 0.5
HFF Acquisition [Member]        
Restructuring Cost and Reserve [Line Items]        
Business Combination, Integration Related Costs $ 12.4 $ 20.1 $ 23.9 $ 41.4