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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended		9 Months Ended
	Sep. 30, 2020	Sep. 30, 2019	Sep. 30, 2020	Sep. 30, 2019	Jun. 30, 2020	Dec. 31, 2019	Jun. 30, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 299.0	$ 304.2	$ 299.0	$ 304.2		$ 328.6		$ 247.3
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	56.4		56.4			69.4
Foreign currency forward contracts receivable	0.0		0.0			0.0
Loans Receivable, Fair Value Disclosure	0.0		0.0			0.0
Deferred compensation plan assets	0.0		0.0			0.0
Mortgage banking derivative asset	0.0		0.0			0.0
Total assets at fair value	56.4		56.4			69.4
Foreign currency forward contracts payable	0.0		0.0			0.0
Deferred compensation plan liabilities	0.0		0.0			0.0
Business Combination, Contingent Consideration, Liability	0.0		0.0			0.0
Mortgage banking derivative liabilities	0.0		0.0			0.0
Total liabilities at fair value	0.0		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			0.0
Foreign currency forward contracts receivable	3.2		3.2			10.5
Loans Receivable, Fair Value Disclosure	1,750.6		1,750.6			527.1
Deferred compensation plan assets	410.7		410.7			349.9
Mortgage banking derivative asset	0.0		0.0			0.0
Total assets at fair value	2,164.5		2,164.5			887.5
Foreign currency forward contracts payable	10.5		10.5			4.4
Deferred compensation plan liabilities	388.4		388.4			346.1
Business Combination, Contingent Consideration, Liability	0.0		0.0			0.0
Mortgage banking derivative liabilities	0.0		0.0			0.0
Total liabilities at fair value	398.9		398.9			350.5
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	6.2	27.0	6.2	27.0	$ (5.5)	10.2	$ (1.3)	6.3
Investments, Fair Value Disclosure	50.2	26.5	50.2	26.5	44.3	34.4	20.0	11.5
Foreign currency forward contracts receivable	0.0		0.0			0.0
Loans Receivable, Fair Value Disclosure	0.0		0.0			0.0
Deferred compensation plan assets	0.0		0.0			0.0
Mortgage banking derivative asset	87.0		87.0			36.1
Total assets at fair value	137.2		137.2			70.5
Foreign currency forward contracts payable	0.0		0.0			0.0
Deferred compensation plan liabilities	0.0		0.0			0.0
Business Combination, Contingent Consideration, Liability	95.0	173.8	95.0	173.8	$ 97.8	148.5	$ 180.3	$ 192.0
Mortgage banking derivative liabilities	80.8		80.8			25.9
Total liabilities at fair value	175.8		175.8			$ 174.4
Investments [Member] | Fair Value, Inputs, Level 3 [Member] | Fair Value, Recurring [Member]
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Earnings	4.3	0.8	6.8	0.8
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0.0	0.0	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	1.6	6.5	9.0	15.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	$ 0.0	$ 0.8	$ 0.0	$ 0.8

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