Effective Tax Rate Reconciliation (Details) - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Income Tax Disclosure [Abstract]
Statutory rate	21.00%	21.00%	21.00%
Tax that would result from use of the federal statutory rate	$ 204.5	$ 162.4	$ 151.1
State and local income tax, net of federal effect	28.7	19.3	22.1
Varying tax rates of foreign affiliates	2.8	1.8	3.3
Valuation Allowances	2.9	0.9	1.0
Stock Options Exercised	(29.4)	(16.1)	(22.1)
Worthless Stock Deduction - Investment in Brazil	(0.0)	(12.0)	(0.0)
Reserve for Uncertain Tax Position - Investment in Brazil	(10.6)	12.0	0.0
Other	(11.0)	(10.5)	(4.5)
Recorded tax expense	$ 187.9	$ 157.8	$ 150.9
Effective tax rate	19.30%	20.40%	21.00%