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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2019	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Assets
Investments, Fair Value Disclosure	$ 328.6	$ 247.3	$ 242.3	$ 212.7
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	69.4	44.6
Mortgage Banking Derivative Assets	0.0	0.0
Total assets at fair value	69.4	44.6
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	10.5	6.5
Loans Receivable, Fair Value Disclosure	527.1	331.2
Deferred compensation plan assets	349.9	258.2
Investments, Fair Value Disclosure	0.0	0.0
Mortgage Banking Derivative Assets	0.0	0.0
Total assets at fair value	887.5	595.9
Liabilities
Foreign currency forward contracts payable	4.4	8.6
Deferred compensation plan liabilities	346.1	251.8
Business Combination, Contingent Consideration, Liability	0.0	0.0
Mortgage Banking Derivative Liabilities	0.0	0.0
Total liabilities at fair value	350.5	260.4
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	34.4	11.5	0.0
Mortgage Banking Derivative Assets	36.1	32.4
Total assets at fair value	70.5	43.9
Liabilities
Foreign currency forward contracts payable	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Business Combination, Contingent Consideration, Liability	148.5	192.0	$ 227.1
Mortgage Banking Derivative Liabilities	25.9	26.1
Total liabilities at fair value	$ 174.4	$ 218.1

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