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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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