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Equity, Option Plans (Details) - Stock Options - USD ($) $ in Millions	12 Months Ended
	Dec. 31, 2018	Dec. 31, 2017	Dec. 31, 2016
Stock-Based Compensation
Total intrinsic value of stock options exercised (in dollars)	$ 188.1	$ 268.7	$ 197.2
Total fair value of stock options vested (in dollars)	51.0	$ 46.3	$ 43.1
Total compensation cost related to non-vested options not yet recognized (in dollars)	$ 140.3
Weighted average expected amortization period	3 years 4 months 28 days

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- Definition

Weighted average period over which unrecognized compensation is expected to be recognized for equity-based compensation plans, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Unrecognized cost of unvested options awarded to employees as compensation.

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Amount of accumulated difference between fair value of underlying shares on dates of exercise and exercise price on options exercised (or share units converted) into shares.

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Fair value of options vested. Excludes equity instruments other than options, for example, but not limited to, share units, stock appreciation rights, restricted stock.

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