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Fair Value Measurements (Assets and Liabilities Measured on a Recurring Basis) (Details) - USD ($) $ in Millions	3 Months Ended
	Mar. 31, 2020	Mar. 31, 2019	Dec. 31, 2019	Dec. 31, 2018
Fair Value, Assets and Liabilities Measured on Recurring and Nonrecurring Basis [Line Items]
Investments, Fair Value Disclosure	$ 302.0	$ 259.6	$ 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	63.2		69.4
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	63.2		69.4
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	6.1		10.5
Loans Receivable, Fair Value Disclosure	1,026.8		527.1
Deferred compensation plan assets	374.2		349.9
Mortgage banking derivative asset	0.0		0.0
Total assets at fair value	1,407.1		887.5
Foreign currency forward contracts payable	6.2		4.4
Deferred compensation plan liabilities	348.4		346.1
Business Combination, Contingent Consideration, Liability	0.0		0.0
Mortgage banking derivative liabilities	0.0		0.0
Total liabilities at fair value	354.6		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	(64.0)	0.6	10.2	6.3
Investments, Fair Value Disclosure	41.4	13.0	34.4	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	118.2		36.1
Total assets at fair value	159.6		70.5
Foreign currency forward contracts payable	0.0		0.0
Deferred compensation plan liabilities	0.0		0.0
Business Combination, Contingent Consideration, Liability	130.0	169.2	148.5	$ 192.0
Mortgage banking derivative liabilities	182.2		25.9
Total liabilities at fair value	312.2		$ 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	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Gain (Loss) Included in Other Comprehensive Income (Loss)	0.0	0.0
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Purchases	7.0	1.5
Fair Value, Measurement with Unobservable Inputs Reconciliation, Recurring Basis, Asset, Settlements	$ 0.0	$ 0.0

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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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