Stock Based Compensation Plans - Schedule of Share Based Compensation Stock Options (Details) - USD ($) $ / shares in Units, $ in Millions	3 Months Ended	9 Months Ended
Sep. 30, 2024	Sep. 30, 2023	Sep. 30, 2024	Sep. 30, 2023
Share-Based Payment Arrangement [Abstract]
Intrinsic Value of Stock Options Exercised	$ 5.3	$ 14.2	$ 86.6	$ 121.9
Stock Compensation Expense Related to Stock Option Awards	$ 4.3	$ 3.8	$ 24.8	$ 22.7
Issued Stock Options	0	0	1	1
Weighted Average Fair Value of Stock Options issued (per share)	$ 0	$ 0	$ 29.9	$ 24.05
Fair Value of Stock Options Issued	$ 0.0	$ 0.0	$ 31.1	$ 24.8

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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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- Definition

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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