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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021	Dec. 31, 2020
Assets
Investments, Fair Value Disclosure	$ 740.8	$ 794.9	$ 639.6	$ 340.3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Assets
Investments, Fair Value Disclosure	51.7	58.3
Foreign currency forward contracts receivable	0.0	0.0
Loans Receivable, Fair Value Disclosure	0.0	0.0
Deferred compensation plan assets	0.0	0.0
Mortgage Banking Derivative Assets	0.0	0.0
Total assets at fair value	51.7	58.3
Liabilities
Foreign currency forward contracts payable	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Business Combination, Contingent Consideration, Liability	0.0	0.0
Mortgage banking derivative liabilities	0.0	0.0
Total liabilities at fair value	0.0	0.0
Fair Value, Inputs, Level 2 [Member] | Fair Value, Recurring [Member]
Assets
Investments, Fair Value Disclosure	0.0	0.0
Foreign currency forward contracts receivable	12.5	3.7
Loans Receivable, Fair Value Disclosure	677.4	463.2
Deferred compensation plan assets	604.3	517.9
Mortgage Banking Derivative Assets	0.0	0.0
Total assets at fair value	1,294.2	984.8
Liabilities
Foreign currency forward contracts payable	8.8	4.8
Deferred compensation plan liabilities	576.1	485.4
Business Combination, Contingent Consideration, Liability	0.0	0.0
Mortgage banking derivative liabilities	0.0	0.0
Total liabilities at fair value	584.9	490.2
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Assets
Investments, Fair Value Disclosure	367.3	452.0	303.5
Foreign currency forward contracts receivable	0.0	0.0
Loans Receivable, Fair Value Disclosure	0.0	0.0
Deferred compensation plan assets	0.0	0.0
Mortgage Banking Derivative Assets	128.0	190.2
Total assets at fair value	495.3	642.2
Liabilities
Foreign currency forward contracts payable	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Business Combination, Contingent Consideration, Liability	57.5	73.2	$ 84.1
Mortgage banking derivative liabilities	117.7	169.5
Total liabilities at fair value	$ 175.2	$ 242.7

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