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Business Combinations, Goodwill and Other Intangible Assets HFF Acquisition (Details) - USD ($) $ in Millions | 12 Months Ended
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Dec. 31, 2020 | Dec. 31, 2019 | Dec. 31, 2018
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Business Combination, Consideration Transferred | $ 0.0 | $ 846.1 | $ 11.6
Document Period End Date | Dec. 31, 2020 |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 64.7 |  |
Cash Acquired from Acquisition |  | 3.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net |  | 4.7 |
Goodwill | 4,224.7 | 4,168.2 | $ 2,697.8
Payments to Acquire Businesses, Gross |  | 40.4 |
HFF Acquisition [Member] |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Business Combination, Consideration Transferred |  | 1,870.7 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Cash and Equivalents |  | 262.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Restricted Cash |  | 5.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Intangible Assets, Other than Goodwill |  | 349.9 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Assets |  | 1,227.8 |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Liabilities |  | 1,104.7 |
Goodwill |  | 1,397.7 |
Business Acquisition, Equity Interest Issued or Issuable, Value Assigned |  | 809.2 |
Shares Issued to Replace Legacy Awards |  | 32.0 |
Payments to Acquire Businesses, Gross |  | $ 1,029.5 |
Line of Credit [Member] |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 2,750.0 |  |
Mortgage servicing rights [Member] |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years 4 months 24 days |  |
Other Intangible Assets [Member] |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 3 years 2 months 12 days |  |

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