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Summary of Significant Accounting Policies Summary of Significant Accounting Policies (Details) $ in Millions	12 Months Ended
	Dec. 31, 2022 USD ($) yr	Dec. 31, 2021 USD ($)	Dec. 31, 2020 USD ($)	Dec. 31, 2019 USD ($)
Mortgage Banking [Abstract]
Identified intangibles, net of accumulated amortization	$ 858.5	$ 887.0
Mortgage-backed Securities Held-to-maturity, Fair Value Disclosure	$ 695.3	561.5
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)	$ (6.4)	8.1	$ 4.6
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	873.8	745.7
Bank Servicing Fees.	119.0	101.8	80.0
Operating Lease, Right-of-Use Asset	776.3	723.4
Investments, Fair Value Disclosure	794.9	639.6	340.3	$ 328.6
Loan loss guarantee reserve	24.8	22.9
Loan loss accrual	29.0	24.6
Allowance For Doubtful Accounts, Current. [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount	66.7	67.6	66.5	$ 71.7
JLL Spark Global Venture funds [Domain]
Investments in and Advance to Affiliates, Subsidiaries, Associates, and Joint Ventures	$ 480.4	330.1
Share-based Payment Arrangement [Member]
Share Based Compensation Arrangement By Share Based Payment Award Sum Of Age Plus Years Of Service Minimum | yr	65
ASC Topic 326 Opening Balance Adjustment | Allowance For Doubtful Accounts, Current. [Member]
SEC Schedule, 12-09, Valuation Allowances and Reserves, Amount			$ 66.5
Mortgage servicing rights [Member]
Mortgage Banking [Abstract]
Identified intangibles, net of accumulated amortization	$ 505.1	$ 478.7

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Revenue from servicing real estate mortgages held by others.

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Amount before tax of foreign currency transaction realized and unrealized gain (loss) recognized in the income statement.

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Sum of the carrying amounts of all intangible assets, excluding goodwill, as of the balance sheet date, net of accumulated amortization and impairment charges.

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Fair value portion of investment securities, including, but not limited to, marketable securities, derivative financial instruments, and investments accounted for under the equity method.

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Fair value of securitized, pay-through debt securities collateralized by real estate mortgage loans classified as held-to-maturity.

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Amount of valuation and qualifying accounts and reserves.

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