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 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, 2020	Dec. 31, 2019	Dec. 31, 2018
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Options outstanding, intrinsic value	$ 3.2
Options vested, intrinsic value	2.4
Proceeds from stock options exercised	6.0	$ 4.4	$ 10.0
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	$ 2.2	$ 3.4	$ 3.0
Exercise Price Range I
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 10.52
Exercise price range, upper range limit	$ 12.26
Stock options outstanding, number of awards	87,000
Stock options outstanding, remaining life (yrs)	11 months 1 day
Stock options outstanding, weighted-average exercise price per share	$ 11.42
Stock options vested, number of awards	87,000
Stock options vested, remaining life (yrs)	11 months 1 day
Stock options vested, weighted-average exercise price per share	$ 11.42
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	$ 26.70
Stock options outstanding, number of awards	460,959
Stock options outstanding, remaining life (yrs)	2 years 2 months 1 day
Stock options outstanding, weighted-average exercise price per share	$ 24.68
Stock options vested, number of awards	355,150
Stock options vested, remaining life (yrs)	14 days
Stock options vested, weighted-average exercise price per share	$ 24.79
Exercise Price Range III
Share-based Payment Arrangement, Option, Exercise Price Range [Line Items]
Exercise price range, lower range limit	$ 27.05
Stock options outstanding, number of awards	709,958
Stock options outstanding, remaining life (yrs)	9 years 10 months 17 days
Stock options outstanding, weighted-average exercise price per share	$ 27.05
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	$ 27.05
Stock options outstanding, number of awards	1,257,917
Stock options outstanding, remaining life (yrs)	6 years 5 months 8 days
Stock options outstanding, weighted-average exercise price per share	$ 25.10
Stock options vested, number of awards	442,150
Stock options vested, remaining life (yrs)	2 months 15 days
Stock options vested, weighted-average exercise price per share	$ 22.16