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

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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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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, 2021	Dec. 31, 2020	Dec. 31, 2019
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options outstanding, intrinsic value	$ 22.9
Options vested, intrinsic value	1.2
Proceeds from stock options exercised	6.7	$ 6.0	$ 4.4
Stock Option Plans For Officers, Directors And Employees
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options exercised in period, total intrinsic value	$ 1.2	$ 2.2	$ 3.4
Exercise Price Range I
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 10.52
Stock options outstanding, number of awards	42,000
Stock options outstanding, remaining life (yrs)	5 months 4 days
Stock options outstanding, weighted-average exercise price per share	$ 10.52
Stock options vested, number of awards	42,000
Stock options vested, remaining life (yrs)	5 months 4 days
Stock options vested, weighted-average exercise price per share	$ 10.52
Exercise Price Range II
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	398,320
Stock options outstanding, remaining life (yrs)	8 years 10 months 2 days
Stock options outstanding, weighted-average exercise price per share	$ 26.11
Stock options vested, number of awards	0
Stock options vested, remaining life (yrs)	0 years
Stock options vested, weighted-average exercise price per share	$ 0
Exercise Price Range III
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit	27.05
Exercise price range, upper range limit	$ 32.58
Stock options outstanding, number of awards	1,622,399
Stock options outstanding, remaining life (yrs)	9 years 1 month 6 days
Stock options outstanding, weighted-average exercise price per share	$ 28.71
Stock options vested, number of awards	0
Stock options vested, remaining life (yrs)	0 years
Stock options vested, weighted-average exercise price per share	$ 0
Exercise Price Range, All Options
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit	10.52
Exercise price range, upper range limit	$ 32.58
Stock options outstanding, number of awards	2,062,719
Stock options outstanding, remaining life (yrs)	8 years 10 months 13 days
Stock options outstanding, weighted-average exercise price per share	$ 27.84
Stock options vested, number of awards	42,000
Stock options vested, remaining life (yrs)	5 months 4 days
Stock options vested, weighted-average exercise price per share	$ 10.52