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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Mar. 31, 2019	Dec. 31, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 259.6	$ 247.3	$ 233.5	$ 242.3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	45.7	44.6
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 asset	0.0	0.0
Total assets at fair value	45.7	44.6
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]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	0.0	0.0
Foreign currency forward contracts receivable	6.7	6.5
Loans Receivable, Fair Value Disclosure	501.3	331.2
Deferred compensation plan assets	295.3	258.2
Mortgage banking derivative asset	0.0	0.0
Total assets at fair value	803.3	595.9
Foreign currency forward contracts payable	5.3	8.6
Deferred compensation plan liabilities	292.3	251.8
Business Combination, Contingent Consideration, Liability	0.0	0.0
Mortgage banking derivative liabilities	0.0	0.0
Total liabilities at fair value	297.6	260.4
Fair Value, Inputs, Level 3 [Member] | Fair Value, Measurements, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	0.6	6.3	5.8	8.7
Investments, Fair Value Disclosure	13.0	11.5
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 asset	34.8	32.4
Total assets at fair value	47.8	43.9
Foreign currency forward contracts payable	0.0	0.0
Deferred compensation plan liabilities	0.0	0.0
Business Combination, Contingent Consideration, Liability	169.2	192.0	$ 220.3	$ 227.1
Mortgage banking derivative liabilities	34.2	26.1
Total liabilities at fair value	$ 203.4	$ 218.1

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Fair value portion of probable future economic benefits obtained or controlled by an entity as a result of past transactions or events.

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