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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016	Dec. 31, 2015
Assets
Investments, Fair Value Disclosure	$ 247.3	$ 242.3	$ 212.7	$ 155.2
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, 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	44.6	47.3
Mortgage Banking Derivative Assets	0.0	0.0
Total assets at fair value	44.6	47.3
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, Measurements, Recurring [Member]
Assets
Foreign currency forward contracts receivable	6.5	13.2
Loans Receivable, Fair Value Disclosure	331.2	317.5
Deferred compensation plan assets	258.2	229.7
Investments, Fair Value Disclosure	0.0	0.0
Mortgage Banking Derivative Assets	0.0	0.0
Total assets at fair value	595.9	560.4
Liabilities
Foreign currency forward contracts payable	8.6	1.9
Deferred compensation plan liabilities	251.8	228.4
Business Combination, Contingent Consideration, Liability	0.0	0.0
Mortgage Banking Derivative Liabilities	0.0	0.0
Total liabilities at fair value	260.4	230.3
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, 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	11.5	0.0
Mortgage Banking Derivative Assets	32.4	19.0
Total assets at fair value	43.9	19.0
Liabilities
Foreign currency forward contracts payable	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Business Combination, Contingent Consideration, Liability	192.0	227.1	$ 229.6
Mortgage Banking Derivative Liabilities	26.1	10.3
Total liabilities at fair value	$ 218.1	$ 237.4

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