Share-based Compensation (Summary of Stock Award Information) (Schedule) (Details) - USD ($) $ / shares in Units, $ in Millions	12 Months Ended
Dec. 31, 2023	Dec. 31, 2022	Dec. 31, 2021
Assumptions used to estimate fair value of options and SARs granted:
Cash received from exercise of options	$ 1.2	$ 13.0	$ 8.9
Income tax benefit related to share-based compensation of our continuing operations (in millions)	$ 17.4	$ 1.3	$ 14.9
Options And SARs
Assumptions used to estimate fair value of options and SARs granted:
Expected dividend yield	0.00%	0.00%	0.00%
Options And SARs \| Minimum
Assumptions used to estimate fair value of options and SARs granted:
Risk-free interest rate	3.12%	3.09%	0.48%
Expected life	3 years 8 months 12 days	3 years 8 months 12 days	3 years 8 months 12 days
Expected volatility	29.00%	33.50%	30.80%
Options And SARs \| Maximum
Assumptions used to estimate fair value of options and SARs granted:
Risk-free interest rate	4.10%	2.27%	1.13%
Expected life	6 years 2 months 12 days	6 years 2 months 12 days	6 years 2 months 12 days
Expected volatility	33.10%	38.10%	33.20%
Options
Assumptions used to estimate fair value of options and SARs granted:
Weighted average grant-date fair value per share of awards granted, options (in dollars per share)	$ 7.18	$ 9.90	$ 8.75
Total intrinsic value of awards exercised		$ 0.5	$ 1.4
SARs
Assumptions used to estimate fair value of options and SARs granted:
Weighted average grant-date fair value per share of awards granted, other than options (in dollars per share)	$ 5.85	$ 7.50	$ 6.79
Total intrinsic value of awards exercised	$ 4.6	$ 7.0	$ 28.9
PSARs
Assumptions used to estimate fair value of options and SARs granted:
Total intrinsic value of awards exercised		$ 0.2	$ 0.1
RSUs
Assumptions used to estimate fair value of options and SARs granted:
Weighted average grant-date fair value per share of awards granted, other than options (in dollars per share)	$ 18.59	$ 25.51	$ 25.69
PSUs
Assumptions used to estimate fair value of options and SARs granted:
Weighted average grant-date fair value per share of awards granted, other than options (in dollars per share)	$ 16.60

Amount of tax benefit for recognition of expense of award under share-based payment arrangement.

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Amount of cash inflow from issuance of shares under share-based payment arrangement. Includes, but is not limited to, option exercised.

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The weighted average fair value at grant date for nonvested equity-based awards issued during the period on other than stock (or unit) option plans (for example, phantom stock or unit plan, stock or unit appreciation rights plan, performance target plan).

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The estimated dividend rate (a percentage of the share price) to be paid (expected dividends) to holders of the underlying shares over the option's term.

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The estimated measure of the percentage by which a share price is expected to fluctuate during a period. Volatility also may be defined as a probability-weighted measure of the dispersion of returns about the mean. The volatility of a share price is the standard deviation of the continuously compounded rates of return on the share over a specified period. That is the same as the standard deviation of the differences in the natural logarithms of the stock prices plus dividends, if any, over the period.

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The risk-free interest rate assumption that is used in valuing an option on its own shares.

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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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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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Expected term of award under share-based payment arrangement, in 'PnYnMnDTnHnMnS' format, for example, 'P1Y5M13D' represents reported fact of one year, five months, and thirteen days.

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