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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, 2021 | Dec. 31, 2020 | Dec. 31, 2019
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Business Combination, Consideration Transferred | $ 68.6 | $ 0.0 | $ 846.1
Document Period End Date | Dec. 31, 2021 |  |
Line of Credit Facility, Maximum Borrowing Capacity | $ 55.5 |  |
Cash Acquired from Acquisition | 13.9 |  |
Business Combination, Recognized Identifiable Assets Acquired and Liabilities Assumed, Net | 34.6 |  |
Goodwill | 4,611.6 | $ 4,224.7 | $ 4,168.2
Payments to Acquire Businesses, Gross | 416.8 |  |
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 3 months 18 days |  |
Other Intangible Assets [Member] |  |  |
Business Acquisition, Equity Interests Issued or Issuable [Line Items] |  |  |
Acquired Finite-lived Intangible Assets, Weighted Average Useful Life | 4 years 10 months 24 days |  |

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- Definition Amount of consideration transferred, consisting of acquisition-date fair value of assets transferred by the acquirer, liabilities incurred by the acquirer, and equity interest issued by the acquirer. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 8 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6613-128477 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 50 -Paragraph 1 -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=120321790&loc=d3e6927-128479 Reference 3: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 30 -Section 30 -Paragraph 7 -URI http://asc.fasb.org/extlink&oid=116859721&loc=d3e6578-128477 + Details
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- Definition Amount recognized as of the acquisition date for the identifiable assets acquired in excess of (less than) the aggregate liabilities assumed. + References Reference 1: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 10 -Section 55 -Paragraph 37 -URI http://asc.fasb.org/extlink&oid=123455525&loc=d3e2207-128464 Reference 2: http://fasb.org/us-gaap/role/ref/legacyRef -Publisher FASB -Name Accounting Standards Codification -Topic 805 -SubTopic 20 -Section 50 -Paragraph 1 -Subparagraph (c) -URI http://asc.fasb.org/extlink&oid=123413009&loc=d3e4845-128472 + Details
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