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Equity, Option Plans (Details) - Stock Options - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Stock-Based Compensation
Total intrinsic value of stock options exercised (in dollars)	$ 436.1	$ 329.6	$ 188.1
Total fair value of stock options vested (in dollars)	62.4	$ 57.3	$ 51.0
Total compensation cost related to non-vested options not yet recognized (in dollars)	$ 177.3
Weighted average expected amortization period	3 years 4 months 24 days

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