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Restructuring and Acquisition Charges (Details) - USD ($) $ in Millions | 3 Months Ended
--- | ---
Mar. 31, 2020 | Mar. 31, 2019
Restructuring and Related Activities [Abstract] |  |
Restructuring and acquisition charges | $ (14.1) | $ (18.6)
Business Combination, Contingent Consideration Arrangements, Change in Amount of Contingent Consideration, Liability | (8.2) | 5.7
Share-based Payment Arrangement, Noncash Expense | 11.2 | 0.0
Restructuring reserve [Roll Forward] |  |
Restructuring reserve, beginning balance | 36.5 | 15.1
Restructuring charges | 11.1 | 12.9
Payments made | (30.8) | (14.4)
Restructuring reserve, ending balance | $ 16.8 | 13.6
Document Period End Date | Mar. 31, 2020 |
Severance [Member] |  |
Restructuring reserve [Roll Forward] |  |
Restructuring reserve, beginning balance | $ 24.3 | 14.0
Restructuring charges | 1.3 | 5.0
Payments made | (14.3) | (7.8)
Restructuring reserve, ending balance | 11.3 | 11.2
Contract Termination [Member] |  |
Restructuring reserve [Roll Forward] |  |
Restructuring reserve, beginning balance | 8.4 | 0.6
Restructuring charges | 2.4 | 0.0
Payments made | (9.6) | (0.1)
Restructuring reserve, ending balance | 1.2 | 0.5
Lease Exit [Member] |  |
Restructuring reserve [Roll Forward] |  |
Restructuring charges | 9.8 |
Other Restructuring [Member] |  |
Restructuring reserve [Roll Forward] |  |
Restructuring reserve, beginning balance | 3.8 | 0.5
Restructuring charges | 7.4 | 7.9
Payments made | (6.9) | (6.5)
Restructuring reserve, ending balance | 4.3 | 1.9
HFF Acquisition [Member] |  |
Restructuring Cost and Reserve [Line Items] |  |
Business Combination, Integration Related Costs | 21.3 | $ 6.5
Restructuring reserve [Roll Forward] |  |
Expense to be recognized for retention awards | $ 100.0 |

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