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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions | 12 Months Ended |  |
--- | --- | --- | ---
Dec. 31, 2020 USD ($) yr | Dec. 31, 2019 USD ($) | Dec. 31, 2018 USD ($) | Jan. 01, 2020 USD ($) | Dec. 31, 2017 USD ($)
Mortgage Banking [Abstract] |  |  |  |  |
Mortgage servicing rights | $ 424.3 | $ 376.4 |  |  |
Mortgage-backed Securities Held-to-maturity, Fair Value Disclosure | $ 459.6 | 423.7 |  |  |
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) | $ (4.6) | (2.4) | $ (4.1) |  |
Bank Servicing Fees. | 80.0 | 63.0 | 49.6 |  |
Operating Lease, Right-of-Use Asset | 707.4 | 804.4 |  |  |
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures | 430.8 | 404.2 |  |  |
Loan loss guarantee reserve | 36.7 |  |  | $ 15.1 |
Retained earnings | 3,975.9 | 3,588.3 |  | 3,573.4 |
Contract with Customer, Asset, Allowance for Credit Loss | (2.1) |  |  | (1.7) |
Contract with Customer, Asset, before Allowance for Credit Loss | 345.7 | 419.3 |  |  |
Contract with Customer, Asset, after Allowance for Credit Loss | 347.8 | 419.3 |  |  |
Loan loss accrual | 22.1 | 20.6 |  |  |
Allowance for Doubtful Other Receivables, Current |  | (68.1) |  | (71.7) |
Deferred Income Tax Assets, Net | 296.5 | 245.4 |  | 250.9 |
Allowance For Doubtful Accounts, Current. [Member] |  |  |  |  |
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount | 66.5 | 68.1 | $ 52.0 |  | $ 51.3
Cumulative Effect, Period of Adoption, Adjustment |  |  |  |  |
Loan loss guarantee reserve |  |  |  | 15.1 |
Retained earnings |  |  |  | (14.9) |
Contract with Customer, Asset, Allowance for Credit Loss |  |  |  | (1.7) |
Allowance for Doubtful Other Receivables, Current |  |  |  | (3.6) |
Deferred Income Tax Assets, Net |  |  |  | $ 5.5 |
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 | $ 69.9 | $ 42.9 |  |  |
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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