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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	Jun. 30, 2019	Mar. 31, 2019	Dec. 31, 2018	Jun. 30, 2018	Mar. 31, 2018	Dec. 31, 2017
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 272.8		$ 247.3	$ 238.7		$ 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	48.7		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	48.7		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	8.0		6.5
Loans Receivable, Fair Value Disclosure	403.1		331.2
Deferred compensation plan assets	297.7		258.2
Mortgage banking derivative asset	0.0		0.0
Total assets at fair value	708.8		595.9
Foreign currency forward contracts payable	10.0		8.6
Deferred compensation plan liabilities	296.2		251.8
Business Combination, Contingent Consideration, Liability	0.0		0.0
Mortgage banking derivative liabilities	0.0		0.0
Total liabilities at fair value	306.2		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	(1.3)	$ 0.6	6.3	8.1	$ 5.8	8.7
Investments, Fair Value Disclosure	20.0	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	43.8		32.4
Total assets at fair value	63.8		43.9
Foreign currency forward contracts payable	0.0		0.0
Deferred compensation plan liabilities	0.0		0.0
Business Combination, Contingent Consideration, Liability	180.3	$ 169.2	192.0	$ 179.6	$ 220.3	$ 227.1
Mortgage banking derivative liabilities	45.1		26.1
Total liabilities at fair value	$ 225.4		$ 218.1

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