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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Assets
Investments, Fair Value Disclosure	$ 639.6	$ 340.3	$ 328.6	$ 247.3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Assets
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
Investments, Fair Value Disclosure	84.5	77.2
Mortgage Banking Derivative Assets	0.0	0.0
Total assets at fair value	84.5	77.2
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
Foreign currency forward contracts receivable	15.9	13.1
Loans Receivable, Fair Value Disclosure	822.3	1,529.2
Deferred compensation plan assets	528.8	446.3
Investments, Fair Value Disclosure	0.0	0.0
Mortgage Banking Derivative Assets	0.0	0.0
Total assets at fair value	1,367.0	1,988.6
Liabilities
Foreign currency forward contracts payable	0.8	3.4
Deferred compensation plan liabilities	513.0	427.6
Business Combination, Contingent Consideration, Liability	0.0	0.0
Mortgage Banking Derivative Liabilities	0.0	0.0
Total liabilities at fair value	513.8	431.0
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Assets
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
Investments, Fair Value Disclosure	182.3	59.3	34.4
Mortgage Banking Derivative Assets	60.4	87.1
Total assets at fair value	242.7	146.4
Liabilities
Foreign currency forward contracts payable	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Business Combination, Contingent Consideration, Liability	84.1	85.7	$ 148.5
Mortgage Banking Derivative Liabilities	38.5	73.4
Total liabilities at fair value	$ 122.6	$ 159.1

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