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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017	Sep. 30, 2017	Jun. 30, 2017	Dec. 31, 2016
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 246.0		$ 242.3	$ 234.2		$ 212.7
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	42.4		47.3
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 asset	0.0		0.0
Total assets at fair value	42.4		47.3
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	5.8		13.2
Loans Receivable, Fair Value Disclosure	617.7		317.5
Deferred compensation plan assets	277.8		229.7
Mortgage banking derivative asset	0.0		0.0
Total assets at fair value	901.3		560.4
Foreign currency forward contracts payable	3.7		1.9
Deferred compensation plan liabilities	268.3		228.4
Business Combination, Contingent Consideration, Liability	0.0		0.0
Mortgage banking derivative liabilities	0.0		0.0
Total liabilities at fair value	272.0		230.3
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	18.7	$ 8.1	8.7	11.5	$ 14.1	15.5
Investments, Fair Value Disclosure	0.0		0.0
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	47.2		19.0
Total assets at fair value	47.2		19.0
Foreign currency forward contracts payable	0.0		0.0
Deferred compensation plan liabilities	0.0		0.0
Business Combination, Contingent Consideration, Liability	163.3	$ 179.6	227.1	$ 223.5	$ 225.6	$ 229.6
Mortgage banking derivative liabilities	28.5		10.3
Total liabilities at fair value	$ 191.8		$ 237.4

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