Amount of cash inflow from exercise of option under share-based payment arrangement.

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The number of shares into which fully or partially vested stock options outstanding as of the balance sheet date can be currently converted under the option plan.

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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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Amount by which the current fair value of the underlying stock exceeds the exercise price of options outstanding.

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The number of shares reserved for issuance pertaining to the outstanding stock options as of the balance sheet date for all option plans in the customized range of exercise prices.

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Weighted average remaining contractual term for vested portions of options outstanding and currently exercisable or convertible, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents the reported fact of one year, five months, and thirteen days.

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Retirement and Share-based Compensation Plans (Schedule of Stock Options Outstanding, By Exercise Price Range) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
	Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options outstanding, intrinsic value	$ 19.4
Options vested, intrinsic value	15.1
Options exercised in period, total intrinsic value	29.9	$ 3.7	$ 1.2
Proceeds from stock options exercised	$ 31.0	$ 4.3	$ 6.7
Exercise Price Range I
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 21.89
Exercise price range, upper range limit	$ 26.72
Stock options outstanding, number of awards	234,148
Stock options outstanding, remaining life (yrs)	6 years 9 months 14 days
Stock options outstanding, weighted-average exercise price per share	$ 26.41
Stock options vested, number of awards	184,148
Stock options vested, remaining life (yrs)	6 years 11 months 26 days
Stock options vested, weighted-average exercise price per share	$ 26.34
Exercise Price Range II
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit	27.05
Exercise price range, upper range limit	$ 32.35
Stock options outstanding, number of awards	457,363
Stock options outstanding, remaining life (yrs)	7 years 1 month 20 days
Stock options outstanding, weighted-average exercise price per share	$ 28.50
Stock options vested, number of awards	355,736
Stock options vested, remaining life (yrs)	7 years 1 month 13 days
Stock options vested, weighted-average exercise price per share	$ 28.61
Exercise Price Range, All Options
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit	21.89
Exercise price range, upper range limit	$ 32.35
Stock options outstanding, number of awards	691,511
Stock options outstanding, remaining life (yrs)	7 years 7 days
Stock options outstanding, weighted-average exercise price per share	$ 27.79
Stock options vested, number of awards	539,884
Stock options vested, remaining life (yrs)	7 years 25 days
Stock options vested, weighted-average exercise price per share	$ 27.83