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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |
--- | --- | ---
Dec. 31, 2021 USD ($) yr | Dec. 31, 2020 USD ($) | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($)
Mortgage Banking [Abstract] |  |  |  |
Mortgage servicing rights | $ 478.7 | $ 424.3 |  |
Mortgage-backed Securities Held-to-maturity, Fair Value Disclosure | $ 561.5 | 459.6 |  |
Real Estate Investments, Net [Abstract] |  |  |  |
Minimum ownership percentage in real estate ventures (in hundredths) | 1.00% |  |  |
Maximum ownership percentage in real estate ventures (in hundredths) | 10.00% |  |  |
Foreign Currency Translation [Abstract] |  |  |  |
Net foreign currency gains (losses) | $ (8.1) | (4.6) | $ (2.4) |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 745.7 | 430.8 |  |
Bank Servicing Fees. | 101.8 | 80.0 | 63.0 |
Operating Lease, Right-of-Use Asset | 723.4 | 707.4 |  |
Contract with Customer, Asset, Allowance for Credit Loss | (2.8) | (2.1) |  |
Contract with Customer, Asset, after Allowance for Credit Loss | 435.9 | 345.7 |  |
Investments, Fair Value Disclosure | 639.6 | 340.3 | 328.6 | $ 247.3
Contract with Customer, Asset, before Allowance for Credit Loss | 438.7 | 347.8 |  |
Loan loss guarantee reserve | 22.9 | 36.7 |  |
Loan loss accrual | 24.6 | 22.1 |  |
Allowance For Doubtful Accounts, Current. [Member] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 67.6 | 66.5 | $ 68.1 | $ 52.0
ASC Topic 326 Opening Balance Adjustment | Allowance For Doubtful Accounts, Current. [Member] |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount |  | 71.7 |  |
JLL Spark Global Venture funds [Domain] |  |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | $ 330.1 | $ 69.9 |  |
Share-based Payment Arrangement [Member] |  |  |  |
Share Based Compensation Arrangement By Share Based Payment Award Sum Of Age Plus Years Of Service Minimum | yr | 65 |  |  |

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