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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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Revenue from servicing real estate mortgages held by others.

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Amount of allowance for credit loss for right to consideration in exchange for good or service transferred to customer when right is conditioned on something other than passage of time.

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