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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Sep. 30, 2019	Jun. 30, 2019	Dec. 31, 2018	Sep. 30, 2018	Jun. 30, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 304.2		$ 247.3	$ 246.0		$ 242.3
Fair Value, Inputs, Level 1 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	56.1		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	56.1		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, 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	7.4		6.5
Loans Receivable, Fair Value Disclosure	825.2		331.2
Deferred compensation plan assets	326.5		258.2
Mortgage banking derivative asset	0.0		0.0
Total assets at fair value	1,159.1		595.9
Foreign currency forward contracts payable	9.7		8.6
Deferred compensation plan liabilities	315.9		251.8
Business Combination, Contingent Consideration, Liability	0.0		0.0
Mortgage banking derivative liabilities	0.0		0.0
Total liabilities at fair value	325.6		260.4
Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Derivative Assets (Liabilities), at Fair Value, Net	27.0	$ (1.3)	6.3	18.7	$ 8.1	8.7
Investments, Fair Value Disclosure	26.5	20.0	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	58.5		32.4
Total assets at fair value	85.0		43.9
Foreign currency forward contracts payable	0.0		0.0
Deferred compensation plan liabilities	0.0		0.0
Business Combination, Contingent Consideration, Liability	173.8	$ 180.3	192.0	$ 163.3	$ 179.6	$ 227.1
Mortgage banking derivative liabilities	53.8		26.1
Total liabilities at fair value	$ 227.6		$ 218.1

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