Income Taxes (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2021	Dec. 31, 2020	Dec. 31, 2019
Income Before Income Taxes [Abstract]
Income before income taxes, Domestic	$ 845.9	$ 711.1	$ 913.1
Income before income taxes, International	1,142.9	698.2	1,025.2
Income Before Income Taxes and Income (Loss) From Equity Method Investments	1,988.8	1,409.3	1,938.3
Income Tax Expense [Abstract]
Income tax expense, current, Federal	144.0	172.2	180.2
Income tax expense, current, State and local	16.5	39.5	33.9
Income tax expense, current, International	303.9	189.1	306.9
Income tax expense, current	464.4	400.8	521.0
Income tax expense, deferred, Federal	40.0	(17.4)	19.1
Income tax expense, deferred, State and local	(11.6)	(6.1)	(22.5)
Income tax expense, deferred, International	(4.1)	4.4	(13.2)
Income tax expense, deferred	24.3	(19.1)	(16.6)
Income tax expense	$ 488.7	$ 381.7	$ 504.4
Reconciliation from the Statutory U.S. Federal Income Tax Rate to Effective Tax Rate [Abstract]
Statutory U.S. federal income tax rate	21.00%	21.00%	21.00%
U.S. state and local income taxes, net of U.S. federal income tax benefit	0.20%	2.20%	0.50%
Impact of foreign operations	3.60%	3.40%	4.50%
Other	(0.20%)	0.50%	0.00%
Effective tax rate	24.60%	27.10%	26.00%
Gain on disposition of subsidiary	$ 50.5	$ 0.0	$ 0.0
Income tax benefit, resolution of uncertain tax positions	32.8
Tax Act, net cash liability, transition tax on accumulated foreign earnings	100.4	112.0
Income tax expense, GILTI	8.8	3.0
Unrecognized Tax Benefits, Penalties and Interest [Abstract]
Unrecognized Tax Benefits, Income Tax Penalties and Interest Expense	2.1	3.8	2.2
Unrecognized Tax Benefits, Income Tax Penalties and Interest Accrued	10.7	23.5
Deferred tax assets:
Compensation	223.8	236.5
Tax loss and credit carryforwards	81.4	67.0
Basis differences from acquisitions	29.9	20.8
Basis differences from short-term assets and liabilities	15.5	34.4
Other	(14.2)	(5.8)
Deferred tax assets	336.4	352.9
Valuation allowance	(18.0)	(15.9)
Net deferred tax assets	318.4	337.0
Deferred tax liabilities:
Goodwill and intangible assets	640.1	611.1
Unremitted foreign earnings	76.6	91.9
Basis differences from investments	6.5
Basis differences from investments		(1.1)
Financial instruments	0.8	0.8
Deferred tax liabilities	724.0	702.7
Long-term deferred tax liabilities	477.3	443.5
Reconciliation of Unrecognized Tax Benefits [Roll Forward]
January 1	182.9	206.8
Current year tax positions	4.4	3.9
Prior year tax positions	1.7	2.8
Reduction of prior year tax positions	(12.1)	(26.1)
Settlements	(13.6)	(2.5)
Foreign currency translation	(0.5)	(2.0)
December 31	162.8	182.9	$ 206.8
Unrecognized tax benefits that would impact effective tax rate	157.3	174.0
Other Assets
Long-term deferred tax assets	$ 71.7	$ 77.8