Schedule of Share Based Compensation Stock Options (Details) - USD ($) $ / shares in Units, shares in Millions, $ in Millions	12 Months Ended
Dec. 31, 2020	Dec. 31, 2019	Dec. 31, 2018
Disclosure Of Compensation Related Costs Sharebased Payments [Abstract]
Intrinsic Value of Stock Options Exercised	$ 159.8	$ 93.1	$ 109.6
Stock Compensation Expense Related to Stock Option Awards	$ 21.1	$ 20.3	$ 21.3
Issued Stock Options	1.9	1.5	2.0
Weighted Average Fair Value of Stock Options issued (per share)	$ 12.85	$ 14.90	$ 9.79
Fair Value of Stock Options Issued	$ 24.5	$ 22.1	$ 19.4

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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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Net number of share options (or share units) granted during the period.

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The weighted average grant-date fair value of options granted during the reporting period as calculated by applying the disclosed option pricing methodology.

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The fair value of stock issued in noncash financing activities.

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Amount of noncash expense for option under share-based payment arrangement.

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